Sunday, May 21, 2017

Insurgence, by Ken MacLeod

Ken MacLeod's The Corporation Wars: Insurgence, is the second book of a trilogy. It (along with the first book in the series, Dissidence, is a finalist for the Prometheus award this year.

Insurgence continues the story of awakened robots struggling for freedom, and uploaded human ex-combatants fighting to retake the planetary system the robots had been mining and exploring.

This installment focuses less on the robots' claim to be agents worthy of separate respect, and more on the uploaded warriors struggle to figure out the nature of the reality they inhabit while mostly following orders to fight the battles their supervisors are pursuing. Their ultimate worry is that they don't have enough information to tell which side they're fighting on or who they are battling to subdue. When you live in a simulation (particularly when you can tell that someone else has access to the control panel) it's a little difficult to be sure that your choices aren't effectively controlled by someone else.

Next, cracks appear in the simulation, and "real" revived people see the shortcomings, but non-player-characters (MacLeod calls them philosophical zombies) think everything is normal, so the real people can tell who's just a simulated person. The idea of zombies in philosophy (sometimes "p-zombies") is an exploration of the idea of consciousness. What if there were beings that acted just like people, but had no consciousness? Would it make a difference to them? Should we accord them lesser rights?

I consider the idea of p-zombies to be incoherent, but many smart people treat the question as exploring an important distinction. MacLeod here undercuts the point of the argument since there are actual behavioral differences. It isn't an exploration of whether consciousness matters, it's just that some characters in the story are imperfect simulations without an inner life, and the actual thinking beings can tell who they are. At the same time, MacLeod makes sure we notice that the robots and AIs who are active in the battles and the scheming do have an inner dialogue, and are making plans and collaborating with others to get things done.

The starting position for the agencies that represent the current Earth government and act under its protection is that only humans are allowed to be sentient. Even AIs' powers are circumscribed. Whenever self awareness arises otherwise, it must be stamped out. It's not clear why this would be a plausible stance, since it's clearly the case that the AIs can become self-aware for short periods, and autonomously operating robots have the capacity for spontaneous self awareness given the right trigger. So they must be constantly battling to defeat uprisings, and track down newly minted sophonts who either try to escape from control, or hide in occupied systems. It would make more sense to forbid use of tools with the capacity for self awareness, than to constantly try to stomp them out. I'd also have a hard time going along with a regime that wanted to outlaw and destroy a class of beings because they were self aware. Self aware and hostile is a separate thing, but that's not the distinction they've settled on.

Before one of the final battles, one of the leaders of the simulated humans challenges the combatants to each eat a slice of p-zombie flesh to prove that they believe they're in a simulation, and that there can't be any moral issues with simulated eating of simulated meat from simulated people that were never actually alive or aware. Except for a few who object to the initiation-ceremony aspect of the act, they all partake.

So there's a lot of exploration here of of philosophical questions of identity, and what it means to be human. The questions of liberty are mostly focussed on what kinds of agents deserve respect as actual people, though I think MacLeod fumbled some of the issues. The action is interesting and the conflict exciting. Besides there are also weaponized communications packets, interrogations of potentially hostile agents by sending them into a dungeon simulation, double and triple agents, and terraforming. It's a pretty good read, and the lead-in to part three, of course leaves a few things to be resolved.

Saturday, April 15, 2017

Dissidence, by Ken MacLeod

Ken MacLeod's The Corporation Wars: Dissidence, is the first book of trilogy. It (along with the second book in the series, Insurgence) is a finalist for the Prometheus award this year.

The story starts with a scene in which a pair of mining robots exploring an asteroid (in a distant solar system) and representing different corporate interests have an encounter, which leads them to realize they have opposing interests, which leads them each to recognize that they have interests, which leads them to self-awareness. The corporations are in a tenuous situation, trying to assert their ownership of the robots, trying to be civil about their contractual cooperation, but objecting strenuously to breaches by the opposing robots. The corporations end up fighting one another, and the robots band together and spread the concept of self-awareness to other nearby robots with sufficient computing capacity. Since the corporations don't seem likely to grant them independence, the robots form an independent faction in the upcoming battle. The corporations are loath to destroy their valuable property just yet.

When they do decide that military actions are called for, they end up dredging up opposing troops of uploaded warriors from past wars. All the AIs and non-self-aware robots, and other actors are under a deep compulsion that only humans and their uploads can actually be armed for combat, even against rogue self-aware robots. So the "humans" spent parts of their time embodied as people in a planetary environment, training and relaxing between missions. In the missions, they're downloaded into articulated space battle suits. Every time they die in battle, they return to the training site to start again. Over time, they find reason to doubt the reality of their home, and eventually detect serious cracks.

The uploads gradually learn enough about their realities to doubt that they're still fighting for the side they were loyal to in their first lives. Apparently part of the distinction between uploads and awakened AIs is that the operators can't tinker with opinions and loyalties directly, but they can easily lie and mislead about who they're representing, and what their opponents are fighting for. Of course, it wouldn't be an interesting story if the operator's control couldn't be subverted.

Ken MacLeod tells a good story, and gets us to think about what kinds of entities should have rights. The authorial point of view allows him to show the action in the eyes alternately of the awakened robots and the revived soldiers, so we feel their fundamental humanness. The characters, ex-human and non-human alike, think about who they should allow into their coalition, whether other actors are actually aware or just act like it, and have varying motives.

My biggest complaint about the story and the characters' attitudes is a simple acceptance among all the characters that some other characters are not real, based simply on statements from people in authority roles. In war, it doesn't make much sense to worry about whether the people shooting at you are actually thinking beings, but deciding that some category of bystanders don't have inner lives should be a cause for more intensive investigation. It's an easy allegation to make, and not far from standard attitudes about our enemies that we've mostly moved past.

Saturday, April 08, 2017

Johanna Sinisalo's The Core of the Sun is a finalist for the Prometheus award this year.

It has enough SF elements to qualify as standard near future fiction, and provides biting social commentary. In feel, it reminds me a lot of Margaret Atwood's The Handmaid's Tale, but I liked this better in several ways.

The story takes place in a future Finland that has managed to selectively breed its women so that they're either docile sex dolls and mothers ("eloi"), or sterile, powerless but competent workers ("morlocks"). They've also outlawed psycho-active drugs from alcohol to heroin, and somehow included capsacin (hot peppers) on that list. The protagonist (Vanna) is a morlock who was raised as an eloi, which allows her to pass in polite company. She's also hooked on hot peppers, and has started dealing in whole, dried, and preserved peppers in order to afford her next fix.

Compared to Handmaid's Tale, the viewpoint character is a more active agent, with more freedom to act for her own interests and to undermine the system; her allies against the state are more fully bought into the fight; the state she fights has taken more reprehensible steps, though it seems to have less thorough control of its subjugated females.

The story is told with a mix of present-tense action, and recollections by Vanna of how she got to her present situation, mostly written as letters to her long-lost eloi sister, Manna. The two were raised away from the city by their eccentric aunt, which gave Vanna the opportunity to act naturally most of the time, and mimic her sister when visitors were around. This gave her the tools to pass as eloi when she grew up.

After the aunt dies, Manna finds a husband who Vanna suspects to be after the family farm, since neither Manna nor Vanna (passing as an eloi) can legally hold title to it. Vanna finds a man to partner with who values her for her unusual intellect and her ability to act independently (a useful tool for his black market activities).

Vanna pursues the secrets behind her sister's disappearance until events force her to escape with her partner. I found the prose (and occasional poetry) to be delightful and very evocative. The characters were convincing, and Vanna's struggle to be her own person in the face of societal expectations was heart breaking.

Saturday, April 01, 2017

The Vital Question, by Nick Lane

Nick Lane's The Vital Question seeks to explain why all eukaryotes share a large number of traits that are completely absent from all bacteria and other simple organisms. As Lane says in his opening page

All complex life shares an astonishing catalogue of elaborate traits, […]. Why, if all of these traits arose by natural selection, in which each step offers some small advantage, did equivalent traits not arise on other occasions in various bacterial groups?

Life arose around half a billion years after the earth's formation, perhaps 4 billion years ago, but then got stuck at the bacterial level of complexity for more than a billion years, half the age of our planet. […] In stark contrast, all morphologically complex organisms […] descend from that singular ancestor about 1.5—2 billion years ago. This ancestor was recognizably a 'modern' cell, with an exquisite internal structure and unprecedented nanomachines encoded by thousands of new genes that are largely unknown in bacteria. There are no surviving evolutionary intermediates, no 'missing links' to give any indication of how or why these complex traits arose, just an unexplained void between the morphological simplicity of bacteria and the awesome complexity of everything else.

Lane claims that this gap in our understanding should be glaringly obvious, and the scientific community should be struggling mightily to fill it in, but (he says) few are working on it, and fewer are talking about it as an important item on the agenda.

Lane's argument is that the combination of bacteria and archaeon that allowed the formation of eukaryotes happened once, and must have quickly evolved to have mitochondria, cilia, and to rely on sex for reproduction, and that all complex life descended from that single event. One of the surprising things is that eukaryotes didn't replace their ancestors; even though they have enough advantages that all complex life descends from that single event, there are still plenty of opportunities for the ancestral forms. The explanation Lane presents is that there's a delicate balance in the energy economy in bacteria and archaea, which doesn't allow the cells to grow much larger, and puts serious constraints on what kinds of mechanisms can be powered inside the cell. When that single archaeon engulfed a bacteria and turned it into the primal mitochondrion, the energy balance changed, and it became possible to store energy and distribute it around the cell, which made it possible to power more kinds of mechanisms, which led to the explosion in the variety of life and ways of living.

The usual story is that the environment changed (the Great Oxygenation) which enabled more styles of living. But what you'd expect if that was the cause would be a separate explosion from every kind of living creature, while what we really see in the evolutionary record is that when there are events like this (the cambrian explosion, e.g.) they radiate from a single progenitor, which tells us there was a significant discovery in that line that enabled the new directions of evolution.

Lynn Margulis' research shows that the form of modern eukaryotes derives from a series of mergers of adjacent bacteria and archaia. (One of the .sig lines I use refers to this) Lane says that while her results hold up, the mergers all occurred in a single line of descent, and all existant eukaryotes radiated out from the same end point of the serial events. Apparently none of the intermediate forms were good platforms from which to generate new life forms.

There are some simpler organisms (giardia among them) that are like eukaryotes in many ways, but lack mitochondria. They have long been viewed as an intermediate evolutionary point between archaia and eukaryotes, but modern phylogenetics (tracing the descent via gene similarity) shows that they're actually descended from eukaryotes, and merely discarded some of the internal structure because it wasn't needed in the environmental niches they occupied. This buttresses Lane's contention that all plants, animals, algae, fungi and protists share a common ancestor.

The common ancestor stored its DNA in a nucleus with a double membrane. The cell itself has a membrane with pores that were inherited by all the branches of its descendants. All the DNA has telomeres as well as introns which are spliced out using common machinery before proteins are built. The golgi apparatus, the form of the cytoskeleton, mitochondria, lysosomes, peroxisomes, the endoplasmic reticulum and the intra-cellular signaling mechanism are also common.

If you're interested, Lane goes into a lot of detail on his hypothesis on the energetic mechanisms that could have led to the evolution of the mitochondrial pathway starting from deep sea hydrothermal vents, where hydrogen and oxygen are bound in a way that can produce positive energy when the bonds are broken. I mostly understood it as I read it, but I'm going to have trouble doing it justice. Here's a precis of the argument; ATP is the end product, and is both stable and easy to extract energy from. A simple mechanism that can produce ATP has the effect of making many energy consuming processes possible.

Hydrothermal vents at the ocean bottom ("black smokers") are places where constantly renewed magma is in contact with sea water, which results in hot acidic water. Lane picks out nearby "alkaline vents" (also on the ocean bottom, but not where magma is exposed) as the plausible site for metabolism to arise. The alkaline version is rich in dissolved hydrogen, accompanied by "other reduced gases including methane, ammonia and sulphide". The rock is riddled with micropores from micrometers to millimeters in size. The flow of warmed sea water is relatively slow, so there's plenty of time for percolation and reaction. There are eddies in the flow, which allows reactive products to accumulate and concentrate locally. Before the Great Oxygenation, the most common gas in both the atmosphere and the ocean was CO2. In this environment, CO2 will react exergonically (releasing energy) with H2 to form CH4 (methane), but it needs a catalyst.

Lane considers it a crucial clue that all living cells drive their energy metabolism via proton gradients across thin membranes. To expand that, the claim is that the production of ATP always happens in the presence of cell membranes that separate proton-rich from proton-poor regions of a cell, and require a constant supply of H2 on the low-density side, and produces ATP on the high-density side. On the low density (alkaline) side, the H2 donates an electron, which is gobbled up in the production of ATP. Both of these reactions happen spontaneously.

Lane then describes a path via which permeable membranes (which don't benefit from better pumping) could evolve to be more selectively permeable, which would allow better pumping to be a benefit. This change makes it possible for the cell to escape from the natural proton gradient, since it can sustain its own internal gradient. Lane hyphothesizes that once selective permeability arises, archaea and bacteria evolved different membrane pumps (evidenced by the fact that they use steroisomers of glycerol) and split into evolutionarily distinct lines.

I'm not sure I explained that very well, but this felt like the first time I've read an explanation of basic cell metabolism that presented a mechanistic picture of the benefit of ATP (stores energy in an easily-extracted form), how the production of ATP is paid for energetically (proton gradients maintained by membranes and selective pumping), and why these designs are fundamental to the difference between bacteria, archaea, and eukaryotes, and eventually lead to the development of chloroplasts as an alternate energy source. Lane gives an explanation at a similar mechanistic level of what happens during apoptosis (programmed cell death; also conserved across the eukaryotes!)

Lane also argues that anti-oxidant supplements interfere with the apoptosis pathway, and thereby reduce health. He presents this as the currently accepted scientific viewpoint, though it's news to me. I need to do more research here.

I learned a lot of biology from this book, and thoroughly enjoyed it.

Sunday, October 02, 2016

The Secret of our Success, by Joseph Henrich

Joseph Henrich's The Secret of Our Success has a fair amount of overlap with Herculano-Houzel's The Human Advantage, which I reviewed in July. Both spend most of their attention on explaining why humans, of all the products of evolution, turned out to be the smartest and hence dominant species on the planet. The Human Advantage focused on what makes the human brain unique, and found some surprising neuronal traits that sets mammals apart from other other animals, and that make primates unique among mammals in their neuronal architecture. Henrich, on the other hand, takes pains to point out that individual humans (even very smart ones) aren't very good at figuring out how to survive in new environments. He uses that evidence to argue that communication and culture make the difference. As individuals, he claims, we aren't much smarter than other primates.

They both agree that cooking was a huge step forward for us, but Henrich takes pains to point out that this only an advantage when we're raised in a cultural group. Unlike practically all other animals, we don't instintively know how to unlock the nutrition in common foodstuffs—without training, it would take a long time (during which you have to be subsisting on something else) to figure out how to prepare most of what we eat.

The book starts out with several stories about lost european explorers becoming stranded, and if they didn't get help from locals, they would starve in the midst of what the locals would consider plenty. In Australia, the Arctic, and Florida, well-funded and trained explorers slowly starved because they couldn't figure out how to find, harvest, or prepare the foods the locals subsisted on, and they either didn't think to ask for help, or they drove away those who tried to help them. In contrast, there are a couple of stories of individual aborigines who are separated from their kin, and do just fine for years, since they grew up gathering and preparing the local bounty. His point is that our strength, as a species, is learning from one another, and picking up on every small increment in survivability.

I've been saying for years (since reading Jared Diamond's Guns, Germs, and Steel) that the thing to realize about the spread of humans and their ability to make use of local flora and fauna is that there were enough people, and people are curious enough that we tried to exploit everything, and we tried to make use of everything available in all conceivable ways. How else to explain the fact that people ate acorns, seal livers, and nardoo. In preparing nardoo, the Australian aborigines grind seeds, leech them with water, mix them with ash during heating, and use mussell shells to serve them. If you miss any step, then like the explorers, you'll die of poisoning or stavation with a full belly.

Along the way, this book has lots of interesting proposals about how culture affects prestige and dominance in ways that make it possible for us to live in larger groups and take advantage of the skills and abilities of more people; how competition for living space between groups leads to cultural differences, and how our ability and drive to share culture and learn from each other leads to increasing communication abilties and common grammar strength across the species. There are interesting tidbits spread throughout.

In talking about how living in larger groups with a larger repertoire of tools and techniques make us more capable without requiring more individual smarts or inventiveness, Henrich gave a list of simple tools that is more interesting than the standard list of 6 simple machines known since antiquity:

wheels, pulleys, springs, screws, projectiles, elastically stored energy (e.g. bows, spring traps), levers, poisons, compressed air (blow guns), rafts, leisters [a barbed spear], and heating (fire and coooking).
Instead of focusing on mechanical advantage as we do with the simple machines, this focuses on shared, reusable knowledge, and shows that there were ideas around to be re-used even in societies that were very primitive by modern standards.

Henrich has a longer more detailed time-line than Herculan-Houzel, and his focuses on evidence about tool use showing accumulation of culture rather than archeological evidence relating to brain size, cooking, and gut size. I enjoyed this book as much as Human Advantage, and it added an interesting, non-conflicting story about the roots of our intelligence. It didn't feel as if it has as much relevance to the question about our place in the universe—once we set out on the path toward communication and shared culture, Henrich didn't mention further roadblocks toward increasing advantage as we exploited the new niche better.

Sunday, September 04, 2016

Seveneves, by Neal Stephenson

Neal Stephenson's Seveneves is a fun read — it won this year's Prometheus Award against a strong field of authors including previous winners and SF greats. That's most of what I can say without spoilers. Alright, also this: the story starts with an unidentified object causing the breakup of the Moon into seven large chunks. Scientists and astronomers quickly run their simulations and analyses and agree that it'll be about two years of bumping against one another and breaking into finer and finer pieces before it all ends in a "White Sky" where fragments blanket the sky and soon start falling in the "Hard Rain" which will kill basically all macroscopic life on the surface. The initial breakup of the moon and the subsequent analysis happens in the opening pages, so this doesn't feel like a spoiler to me. If you're likely to read the book (it's Neal Stephenson, and it won the Prometheus Award), and don't like spoilers, I recommend reading just to the end of this paragraph. I enjoyed the book, and it qualifies as a Prometheus winner because nearly everything that happens does so without the presence of anything like a government. There are many failures of coordination but also a lot of successes. The ending is hopeful.

The first part of the book is about what happens over those approximately two years as everyone pulls together. The next part is what happens next to those who survive in space, and the final section is about what happens much later to the descendents of those who survived. In the first part, there's a lot of cooperation even though everyone agrees that the vast majority are going to die very soon. An astonishing number of people and institutions pull together to do what can be done to save a representative sample of humanity, and ensure they have enough supplies and tools to stand a decent chance of surviving. There is a little bit of cowboy heroics, but for the most part, people are putting the species before themselves. Stephenson does a good job of depicting the impact of politics and struggles between factions, while also showing the technology that could make it all work, and the interesting personal dynamics that go into creating a new society from scratch in an inhospitable environment.

The main conflict in the second part is set up because the President of the US violates the broad agreement that politicians wouldn't be allowed on the rescue fleet. At the very last minute before it becomes impossible, she gets on the last rocket to take off and joins those expected to survive. She is not welcomed by the leaders of the expedition, but being a consummate politician, she recruits followers from the least powerful, and ends up splitting the escape fleet into two that are both too small to carry out the planned mission. The survivors face the challenge of moving from a low orbit under constant threat from the remaining chunks (which are predicted to eventually coalesce into a ring) to someplace higher and safer. Disastrous events ensue, and a tiny remnant group manages to find refuge in one of the remaining large chunks of the Moon, a nickel-iron lump with a crevice big enough to shelter them while they recover, repair, and deploy their remaining technology to sustainably feed themselves and begin the process of procreation so there can be a next chapter. Most of the action is interpersonal, with politics and factional struggles driving the plot. Stephenson keeps this section short, and skips fairly quickly to a time a few thousand years in the future.

The ring has stabilized and civilization has spread around it and developed in some interesting directions. This is where the projections of plausible technologies get extra interesting. What kinds of technologies would develop in a society with an abundance of hard metals and no gravity? Where the challenge isn't getting into space, but getting around in the vast emptiness? The society takes advantage of their location (it's easier to build a sky-hook from the middle than from the ground) and finds ways to thrive.

Stephenson's expectation that starting from a very small base the population would fracture into competing polities and separate societies seems thin to me, but he uses it to drive the plot in interesting directions. At the end the residents of the ring start making attempts to explore the newly habitable surface of Earth and encounter descendents of two groups of people who found ways to survive the "Hard Rain" on the surface. One of them seems somewhat plausible, and was reasonably foreseeable from the first part of the story. The other group seemed like a real stretch to me, and the mechanism of their survival is just hinted at. But that's a small part of the story.

Stephenson tells a fascinating story about the struggle to survive and the collaboration it takes to succeed in an extreme situation. Along the way, we meet some interesting characters, and read about some new technologies that it would be great fun to play with.

Sunday, July 17, 2016

Suzana Herculano-Houzel's The Human Advantage is a good book with some important insights hidden behind a fairly dry and dense presentation on "how I made these important discoveries." Herculano-Houzel (by her own account) pioneered a technique for determining the number of neurons in brain tissue, and managed (through a fair number of mildly interesting adventures) to bring together samples of many different primate, rodent, and other mammalian brains in order to work out the scaling laws that govern how brains and neuron counts grow with body mass in different tissues across different lineages. She shows a lot of graphs and charts to demonstrate that (with two exceptions) for most mammals, neuron counts scale up with an exponent of .5 with body mass, but in primates, the scaling factor is .8. If neurons have to be added in order to increase intelligence, this means that primates have a huge advantage. In order to get smarter, brains and neuron count have to increase. Larger bodies are necessary in order to sustain a larger brain, and if neuron count or neuron density is the limiting factor in intelligence, then you want to be able to pack more neurons into a denser brain in order not to require an enormous body.

Once Herculano-Houzel has established the basic scaling laws, she delves into the economics of maintaining a sufficiently neuron rich brain. The comparative scaling laws mean that as you look at bigger and bigger species of mammals, the neuron counts increase with the square root of the body mass. As primate species get larger, their neuron count increases much more quickly, which means that for a given body size, a primate is capable of supporting a larger brain than would a mammal. The cross-over point where the two lineages have comparable neuron sizes are with body sizes in the 10 gram range. At any larger size, if you compare a primate with another similar sized mammal, the primate is probably smarter.

There is a separate literature showing the energy requirements for many particular species. Herculano-Houzel used her new numbers on neurons for rodent and primate species to show that there is a direct correlation between the number of neurons and the amount of glucose consumed per minute by the brain. For humans (and others in the Homo lineage, being able to take advantage of the primate scaling laws gives a big boost, but you still have to find a way to ingest sufficient calories to afford the bigger brain.

Humans have two main advantages on this score compared to other primates. Walking on two legs is much more energy efficient than knuckle-walking like other (primarily arboreal) primates or on four legs. This increases the range over which foragers could range, and also freed up hands for gathering and carrying. It's not clear what originally drove bipedalism in the homo line, but it occurs at the same branch point that leads to the massive growth in cranial capacity.

The other big human advantage is cooking. I've seen discussions before that cooking increases the efficiency of digestion, and led to our shorter digestive tract, which allowed us to switch energy resources from digestion to our brains, but Herculano-Houzel points out that even before control of fire, other kinds of preparation (chopping and mashing for example) reduce the energy required for digestion. The anthropological evidence for food preparation goes back much further than the evidence of cooking, and significantly after bipedalism. The earliest evidence of eating meat is swiftly followed by anatomic adaptations to a more efficient diet, which is quickly followed by better tools, and the then bigger brains. Part of the evolutionary adaptation for bigger brains included smaller jaws.

Evidence of tool use and manufacture date back to 3.3 MYA (Million Years Ago). This date was recently pushed back from 2.6 MYA. These tools were simple flint knives. Archaeologists wouldn't count rocks that were used for pounding, since they are impossible to distinguish from unworked rocks. The flint knives would have been useful for cutting up meat, which would make it more digestible, and is necessary in order to survive with smaller jaws. Presumably, eating primitively processed foods had to become habitual before later evolutionary steps that relied on it would have survived in the population. The archaeological evidence gives the following timeline:

  1. 4.4 MYA: bipedalism appears
  2. 3.3 MYA: earliest tool use
  3. 2.5 MYA: eating meat
  4. 2.4 MYA: beginning of the reduction in size of the jaw
  5. 1.9 MYA: smaller gut is clearly present
  6. 1.7 MYA to 300 KYA: The Acheulean hand axe
  7. 1.5 MYA-100 KYA: start of the increase in cranial capacity
  8. 1 MYA: Clear indications of cooking

Another tantalizing clue is that the taste for cooked food may pre-date adoption of the habit. Herculano-Houzel refers to two studies that show that chimpanzees have a very strong preference for the taste of cooked food over raw. I don't know whether this has been investigated in other lineages, but if so, (even if it's just the body innately being able to detect foods that are provide big efficiency gains) it provides a boost for any lineage that can figure out how to reliably prepare foods--once you start, it would be an easy habit to keep, providing that the right food sources and tools are accessible.

Earlier, I mentioned that there are two exceptions to the laws regulating the number of neurons in primates and in all other mammals. The first is gorillas, which have brains and neuron counts much closer to those of other mammals rather than those expected of a primate. This fact about gorillas has been throwing off the results of previous researchers, who could only measure brain capacity. They concluded that the rules for primates would be the same as for other mammals, and argued that it was humans that were outliers. Once you plot the detailed data from small and medium primates and compare to mammals, it's easy to see a different trend line applies, and that humans fit on the primate line and gorillas do not. The other exception is elephants. (Herculano-Houzel has an entertaining section about her adventures getting elephant brains to analyze.) Elephants have brains whose size follows the standard scaling rule for mammals. They're huge, and they have huge brains. But their neurons are distributed very differently from all other species. 98% of the neurons are in the cerebellum, while the normal number doesn't get much above 80%. So elephants have big brains and a lot of neurons, but this explains why they're not even smarter than us, presuming neurons in the cerebral cortex are the thing that matters most.

Anyway, the later clues about cooking and bipedalism only added to my reaction that this work may provide an improved answer to the Fermi paradox. Herculano-Houzel doesn't appear to have data about the brains of animals beyond mammals, but if all the mammals outside of primates share a common scaling factor, then that's an indication that it's hard to evolve intelligence given the standard energy budget. It takes a special trick (which didn't have an immediate obviously benefit in the small primates in which it evolved) which was only discovered in one previously obscure branch of the mammal family tree to enable the efficient scaling that allows bodies to grow large enough to support brains supporting enough neurons to enable tool use. This enables (with other accidents like bipedalism and prepared food appearing in the same lineage) the feedback cycle that led to our massive growth in intelligence.

I've never been very worried by the argument that says the Fermi paradox indicates that there's a Great Filter, and if we can't figure out what the hard step was in our past, we should expect to encounter a hurdle in our future that has stopped other species from getting to space. The Human Advantage makes me even more sanguine. It's hard to evolve an intelligent species. There are a lot of happy accidents in our past, and the likely number of extra-terrestrial species in our light cone may be smaller than we thought. It would be nice to see more data showing the scaling laws that apply outside the primates (and in the cetaceans, which she didn't give much data about). I'll be surprised if any of them show divergent scaling progression compared to baseline mammals.

Thursday, July 14, 2016

Jo Walton's The Just City investigates the nature of justice, while telling an enchanting story involving gods, mortals and robots trying to actually build the Just City hypothesized by Plato. The goddess Pallas Athene brings together 10,000 children and a few hundred adults from many different times and places to found a new city (on the island of Atlantis) according to Plato's prescriptions in The Republic. Plato's main goal in The Republic was to explain the nature of Justice (the words 'Just' and 'Justice' occur more than 150 times on the wikipedia page), so Walton has plenty of room to explore the idea from several different directions.

In order to get infrastructure in place without burdening the new inhabitants (who are supposed to be coddled and trained so they can understand Justice) the goddess brings in robots to build housing and meeting rooms. The robots are kept around to take care of maintenance and other tasks that Plato didn't describe the city's inhabitants as handling. When the historical Socrates (as envisioned by Walton) joins the city, he turns out to be a very inquisitive man. Since the robots display some autonomy, Socrates wonders whether they have individual personalities and whether they're thinking and aware. This leads to even more opportunities for questions about Justice.

Pallas Athene wants to populate the city with willing participants, so the children (exactly half girls and half boys) all are from disadvantaged circumstances. The adults are all people who prayed for a chance to live in Plato's Republic, so (considering how often the book is actually read in the original greek, and in what historical periods) most are men from antiquity, and the women are nearly all from more modern times. This leads to some interesting political factions, and changing of practices as time goes on and the oldest denizens die off first.

Not all of the children are happy to be there, even though all of them agree that their previous lives (most were slaves) were worse. Even so, not having been given a choice rankles with a few, and their reactions are also interesting.

Many of Plato's ideas are reasonably modern, but others are very outdated, like assigning citizens to societal roles according to their metal. The adults of The Just City spend a lot of effort training and testing the children in order to place them appropriately. Many of the adults are uncomfortable with this duty, but they carry it out, and even put their thumbs on the scales as necessary in order to make the numbers come out right according to Plato's very Greek ideas about numerical harmony. When some of the children figure out that test rankings are being adjusted in order to fit pre-defined notions of how many should be in each category, they challenge the adults, and as with everything else that goes on in the city, philosophical discussion and socratic dialogue ensues.

Since there's limited space on the island, procreation must be limited and sexual activity controlled. The children (and adults) find creative ways around the restrictions, but this means discussion of sexual mores and prohibitions are necessary. We hear about everything from rape and unwanted intimacy to Plato's ignorance of issues of women's hygiene. For the most part the adults attempt to do everything according to Plato's prescriptions, but there are several clear gaps in Plato's planning which leads to the need for endless committee meetings (most of which we, mercifully, hear about afterward, rather than having to endure.)

Walton does a wonderful job of presenting these philosophical questions of freedom, choice, and justice through the character's activity and interactions. In the end, we get to know these people who are all striving to be their best, and to create an environment in which justice is available to all, even though humans always have incompatible desires. We even get some satisfying answers to new and old questions and some unresolved issues to ponder on our own.

Tuesday, July 05, 2016

To Explain The World: by Steven Weinberg

Steven Weinberg's To Explain The World provides a very good introduction to the age of scientific discovery. Weinberg's goal is to explain how the early scientists incrementally developed the scientific method as they were learning, developing new theory, and testing their ideas, but I thought the presentation also did an amazing job of explaining the context of the discoveries in a way that made each contribution much more understandable. I've read many histories of science, so few of the foreground facts (who discovered what and when) were new to me, but being reminded about what else was going on at the time, and which people had been talking to (or arguing with) one another gave more context and made it easier to judge the relevance and difficulty of their accomplishments.

Weinberg starts with the ancient greeks, and explains how they were interested in the nature of reality, and our place in the cosmos, but had no concept of comparing their proposed explanations to the world or in any way testing their ideas. In some ways, some of those whose names live on were proposing better solutions than any that would appear for thousands of years, but without demonstrations of their truth or applicability, they wouldn't be influential until rediscovered in later circumstances, where better scientific methods would allow them to take part in a system of understanding.

In the hellenistic period in Egypt after the death of Alexander, individuals were able to figure out that falling objects accelerate, that air is a real substance that can displace water, and to invent effective pumps and accurate water clocks. When they made useful artifacts, their ideas had consequences and were remembered. When they theorized ex nihilo, they were more evanescent and didn't effect many later thinkers. Around this time, Archimedes systematized approaches to the simple machines, and recorded drawings of many useful tools built from screws, ramps, levers, and pulleys.

Starting from their certainty that heavenly bodies must move in circles, Plato asked some of his students what combinations of circular motions could produce the wandering motions of the seven known planets against the starry background that the Greeks could see with their unaided eyes. The pattern of inventing and compounding epicycles would continue until the time of Kepler.

Weinberg's final word on Leibniz and Newton is illustrative of how he analyzes the interactions between scientists, and looks for their influences on one another and on progress generally.

The judgement of contemporary scholars is that Leibniz and Newton had discovered the calculus independently. Newton accomplished this a decade earlier than Leibniz, but Leibniz deserves great credit for publishing his work. In contrast, after his original effort in 1671 to find a publisher for his treatise on calculus, Newton allowed this work to remain hidden until he was forced into the open by the controversy with Leibniz. The decision to go public is generally a critical element in the process of scientific discovery. It represents a judgement by the author that the work is correct and ready to be used by other scientists. For this reason, the credit for a scientific discovery today usually goes to the first to publish. But though Leibniz was the first to publish on calculus, as we shall see it was Newton rather than Leibniz who applied calculus to problems in science. Though, like Descartes, Leibniz was a great mathematics whose philosophical work is much admired, he made no important contributions to natural science.

Weinberg gives credit to the Greeks for discovering and passing on the idea that nature follows consistent rules, and that we can use mathematics to build models which will help us explain and understand them. It wasn't until the 17th century however, that scientists realized that this can be applied pervasively, and actively looked for opportunities to explore new phenomena and describe them mathematically. The final two thirds of the book is a discussion of the conversation that arose among scientists as they investigated, shared observations, and looked for ways to apply fewer and broader explanations to more and more fields.

Sunday, October 04, 2015

Ex Urbe on Machiavelli

I just read a five part sequence (Thanks Scott) by Ada Palmer on Machiavelli that is extremely well-written and very effective. Part one gives the context of Machiavelli's work, and explains how important Florence was to him and why that continues to matter to us. Palmer doesn't spend much virtual ink actually justifying Machiavelli as a hero, rather she explains the dire situation Florence was in, and how and why that mattered to Machiavelli.

She ends the first part of the series by giving him as great an accolade as she can imagine. You know the parlor game in which you imagine sending a message back to some past historical figure on their deathbed (not in order to change history, but to tell them that they made a difference)? She would take that opportunity to reassure Machiavelli that his beloved Florence continues to flourish and is held in such high esteem that (by the UNESCO World Heritage Convention) "it is on the list of places [that] all the powers of the Earth have agreed to protect with all their resources."

In the next three or four parts, Palmer explains and justifies her claim that Machiavelli invented modern Political Science and the modern approach to ethics. It's well worth reading.

Monday, August 24, 2015

Eifelheim, by Michael Flynn



Michael Flynn's Eifelheim is a nice twist on a first-contact story. The contact takes place when insectoid aliens traveling through string theory's seventh folded dimension get stranded on Earth in 1300s medieval Germany. They are a relatively small party, but they have just the right physical form to trigger everyone's prejudices about devils. Flynn does a great job of depicting a highly religious society with a few educated (for the time) leaders.
Unfortunately for the Germans trying to figure out whether to welcome or vilify their visitors, the plague is sweeping through Europe, and it's going to kill most of them. The scenes with the survivors taking care of their loved ones are touching and gruesome. Meanwhile, the aliens are wasting away because earth's biota is missing an essential protein for them. "They eat their fill, but are not nourished".
In a parallel stream, a pair of scientist (living together, but drifting apart) are searching for answers that intersect this distant past. Sharon is trying to piece together a grand-unified theory to explain anomalous measurements, and being inspired by random phrases uttered by Tom. Tom is a sociologist tring to figure out why Eifelheim, an obscure German hill town, was never resettled after the plagues. Of course there are enough clues in obscure historical records to inspire a theory.
Of course many of the villagers are simple superstitious peasants, but Dietrich, their Pastor was educated in Paris and Vienna, and has a more open mind. Dietrich struggles to convince the villagers and the manorial lord that the visitors are "men" by the meaning of the Bible, rather than devils, and then works to convert the visitors to his faith. He has some small successes; apparently the aliens don't recognize superstition when they see it. The linguistic difficulties are enough that it's not always clear when he is speaking literally or metaphorically. Similar issues impede his understanding of the science they understand--both biology to explain the diseases afflicting both parties and astronomy.
The characters are compelling, the science is a plausible stretch, the historicism is infecting, and their travails are affecting. Dietrich treats visiting Jews (escaping from pogroms and rabble afraid that they may have brought the plague, intentionally or not) the same as he does the visitors; all are "men" in God's sight are worthy of respect and an attempt to convince them to act as their best instincts direct them. The final scene, in modern times, left tears in my eyes.




Saturday, January 17, 2015

New York from 7500 Feet at Night

These are some pretty amazing pictures. The photographer is planning to do other cities soon.