Natural selection gave a freediving people in Southeast Asia bigger spleens

This is the first evidence that I’m aware of for genetic adaptation in a subgroup of modern humans.

The Bajau people of Southeast Asia, known as Sea Nomads, spend their whole lives at sea, working eight-hour diving shifts with traditional equipment and short breaks to catch fish and shellfish for their families. In a study published April 19 in the journal Cell, researchers report that the extraordinary diving abilities of the Bajau may be thanks in part to their unusually large spleens. The adaptation, the researchers say, is a rare example of natural selection in modern humans — and one that could provide medically relevant insight into how humans manage acute hypoxia.

https://www.sciencedaily.com/releases/2018/04/180419131128.htm

Recent Books

I just finished rereading Peter Watts’ Blindsight and Echopraxia. They’re both terrific, and I recommend them unreservedly to anyone who’s into wildly imaginative hard sci fi. The only downside is that now I’ll need to spend the next couple of months reading just the most interesting 10% of his citations…

Other good recent reads that I remember right offhand:

John Kessel, The Moon and the Other — interesting look at gender through the lens of a future matriarchy.

Other Minds: The Octopus, the Sea, and the Deep Origins of Consciousness

Genesis: The Scientific Quest for Life’s Origin — good overview of the extant theories for how life on Earth got started. I also read parts of Life’s Ratchet, on the same topic, but I didn’t think it was nearly as good.

Ellen Ullman, Life in Code, which had some really good bits, but overall was a bit weak, I thought. Or at least I didn’t enjoy it nearly as much as her novel The Bug.

And some rereads… Kate Atkinson’s Life After Life, Greg Egan’s Diaspora, The Graveyard Book, a bunch of nonfiction…

Saturation Diving

If you wanted to make a million dollars in a few years, there are definitely worse ways to do it…

For 52 straight days this winter, Shannon Hovey woke up in the company of five other men in a metal tube, 20 feet long and seven feet in diameter, tucked deep inside a ship in the Gulf of Mexico. He retrieved his breakfast from a hatch (usually eggs), read a briefing for the day, and listened for a disembodied voice to tell him when it was time to put on a rubber suit and get to work. Life in the tube was built around going through these same steps day after day after day … while trying not to think about the fact that any unintended breach in his temporary metal home would mean a fast, agonizing death.

Hovey works in one of the least known, most dangerous, and, frankly, most bizarre professions on Earth. He is a saturation diver—one of the men (right now they are all men) who do construction and demolition work at depths up to 1,000 feet or more below the surface of the ocean.

https://www.atlasobscura.com/articles/what-is-a-saturation-diver.amp

Poem

“Whenever you’re called on to make up your mind,
and you’re hampered by not having any,
the best way to solve the dilemma, you’ll find,
is simply by spinning a penny.
No — not so that chance shall decide the affair
while you’re passively standing there moping;
but the moment the penny is up in the air,
you suddenly know what you’re hoping.”

(Piet Hein)

Jumping Spiders Can Think Ahead, Plan Detours

With brains the size of a sesame seed, jumping spiders may seem like mental lightweights.

But a new study shows that many species plan out intricate detours to reach their prey—smarts usually associated with far bigger creatures.

The arachnids, already well known for their colors and elaborate mating rituals, have sharp vision and an impressive awareness of three-dimensional space. (See “Surprise: Jumping Spiders Can See More Colors Than You Can.”)

“Their vision is more on par with vertebrates,” says Damian Elias of the University of California, Berkeley, who wasn’t involved in the new research. “And that allows them to do things that are physically impossible for other animals that size.”

Jumping spiders of the subfamily Spartaeinae (spar-TAY-in-ay) are particularly ambitious—they eat other spiders. Researchers suspect that preying on other predators requires extra intelligence and cunning.

In the 1980s and 1990s, Robert Jackson of New Zealand’s University of Canterbury demonstrated that Portia fimbriata, a member of this spider-snacking subfamily, methodically plans winding detours to sneak up on prey spiders. Portia can even find hidden prey, suggesting that the predator can visualize its prey’s location and a path to get there.

https://news.nationalgeographic.com/2016/01/160121-jumping-spiders-animals-science/

Physicists Discover Inorganic Dust With Lifelike Qualities (2007)

https://www.sciencedaily.com/releases/2007/08/070814150630.htm

V.N. Tsytovich of the General Physics Institute, Russian Academy of Science, in Moscow, working with colleagues there and at the Max-Planck Institute for Extraterrestrial Physics in Garching, Germany and the University of Sydney, Australia, has studied the behaviour of complex mixtures of inorganic materials in a plasma. Plasma is essentially the fourth state of matter beyond solid, liquid and gas, in which electrons are torn from atoms leaving behind a miasma of charged particles.

Until now, physicists assumed that there could be little organisation in such a cloud of particles. However, Tsytovich and his colleagues demonstrated, using a computer model of molecular dynamics, that particles in a plasma can undergo self-organization as electronic charges become separated and the plasma becomes polarized. This effect results in microscopic strands of solid particles that twist into corkscrew shapes, or helical structures. These helical strands are themselves electronically charged and are attracted to each other.

Quite bizarrely, not only do these helical strands interact in a counterintuitive way in which like can attract like, but they also undergo changes that are normally associated with biological molecules, such as DNA and proteins, say the researchers. They can, for instance, divide, or bifurcate, to form two copies of the original structure. These new structures can also interact to induce changes in their neighbours and they can even evolve into yet more structures as less stable ones break down, leaving behind only the fittest structures in the plasma.

So, could helical clusters formed from interstellar dust be somehow alive? “These complex, self-organized plasma structures exhibit all the necessary properties to qualify them as candidates for inorganic living matter,” says Tsytovich, “they are autonomous, they reproduce and they evolve.”

On the redistribution of sex

Robin Hanson’s recent post “Two Types of Envy”, on the similarities & differences of redistribution of wealth vs the redistribution of sex, has generated quite a lot of heat and noise. Most of it (on all sides) is the usual horror-show that every internet controversy becomes. But I ran across a few things that I thought were interesting & thought-provoking reads. In the unlikely event that this post spreads beyond my blog’s usual audience, please note that by saying that I find these posts philosophically interesting, I am not taking or advocating any particular stance on the issue. Also note that while this post will be auto-shared to Facebook, I will not see any comments posted there.

The question, then, is how to dwell in the ambivalent place where we acknowledge that no one is obligated to desire anyone else, that no one has a right to be desired, but also that who is desired and who isn’t is a political question, a question usually answered by more general patterns of domination and exclusion. It is striking, though unsurprising, that while men tend to respond to sexual marginalisation with a sense of entitlement to women’s bodies, women who experience sexual marginalisation typically respond with talk not of entitlement but empowerment. Or, insofar as they do speak of entitlement, it is entitlement to respect, not to other people’s bodies. That said, the radical self-love movements among black, fat and disabled women do ask us to treat our sexual preferences as less than perfectly fixed. ‘Black is beautiful’ and ‘Big is beautiful’ are not just slogans of empowerment, but proposals for a revaluation of our values. Lindy West describes studying photographs of fat women and asking herself what it would be to see these bodies – bodies that previously filled her with shame and self-loathing – as objectively beautiful. This, she says, isn’t a theoretical issue, but a perceptual one: a way of looking at certain bodies – one’s own and others’ – sidelong, inviting and coaxing a gestalt-shift from revulsion to admiration. The question posed by radical self-love movements is not whether there is a right to sex (there isn’t), but whether there is a duty to transfigure, as best we can, our desires.

To take this question seriously requires that we recognise that the very idea of fixed sexual preference is political, not metaphysical. As a matter of good politics, we treat the preferences of others as sacred: we are rightly wary of speaking of what people really want, or what some idealised version of them would want. That way, we know, authoritarianism lies. This is true, most of all, in sex, where invocations of real or ideal desires have long been used as a cover for the rape of women and gay men. But the fact is that our sexual preferences can and do alter, sometimes under the operation of our own wills – not automatically, but not impossibly either. What’s more, sexual desire doesn’t always neatly conform to our own sense of it, as generations of gay men and women can attest. Desire can take us by surprise, leading us somewhere we hadn’t imagined we would ever go, or towards someone we never thought we would lust after, or love. In the very best cases, the cases that perhaps ground our best hope, desire can cut against what politics has chosen for us, and choose for itself.

‘all the difficulties, great or small, of Communism ‘

From John Stuart Mill, famed 19th C utilitarianist economist and free market advocate:

If the choice were to be made between Communism with all its chances, and the present state of society with all its sufferings and injustices, if the institution of private property necessarily carried with it as a consequence that the produce of labour should be apportioned as we now see it almost in inverse proportion to labour, the largest portions to those who have never worked at all, the next largest to those whose work is almost nominal, and so in descending scale, the remuneration dwindling as the work grows harder and more disagreeable until the most fatiguing and exhausting bodily labour cannot count with certainty on being able to earn even the necessities of life; if this or Communism were the alternative, all the difficulties, great or small, of Communism would be but as dust in the balance.

Via http://slatestarcodex.com/2018/04/30/book-review-history-of-the-fabian-society/