Tag Archives: paleontology

Being kind to the blarney

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Reading Yuval Noah Harari’s How Humans Took Over the World (Unstoppable Us 1) for the Telegraph, 9 October 2022

“And just think how sad the last mammoth must have been all on her own,” writes Yuval Noah Harari, as he invites his pre-teen audience to contemplate our species’ long track record in wiping out countless varieties of big animal (giant flightless birds; elephantine sloths; the list is long).

Harari is spreading his young person’s history of humankind across four illustrated volumes. This is the first, and describes how we managed to exterminate our way to planetary dominance (so a certain mawkishness is allowable). Following the Bauplan of Harari’s 2011 adult bestseller Sapiens: A Brief History of Humankind, we can reasonably look forward to a triumphalist futuristic fourth volume in which all the monsters that terrified and/or fed our ancestors are resurrected by our CRISPR-wielding post-human descendants and released into some sort of 3D-printed world zoo.

Why survey such a vast sweep of evolutionary history through the keyhole of “what we really know”? Why not say what you’ve got to say, and leave the error-correction to your young reader’s own curiosity and further reading? When I was a kid, Patrick Moore was still writing about Venus’s already rather unlikely world ocean. I was inspired by such unchained speculation, and I don’t think I sustained any lasting intellectual harm.

But we are where we are: the world is haunted by the spectre of untruth and is besotted with the wisdom of crowds, and Harari is at pains in his afterword to point out how carefully staff at Penguin and his own “social impact company” Sapienship weighed every sentence and every illustration, lest it might misrepresent something or “hurt people”.

As a consequence, How Humans Took Over the World is, for all its many strengths, one of the least odd books I have ever read.

How Humans Took Over the World is an easy-to-read epic that sets out to be scrupulously truthful about what we do and do not know about the past. In simple, direct terms, Harari explains that we’re the only species that believes stories; stories enabled cooperation; and cooperation made it possible for us to smother and consume large amounts of the planet.

Harari’s ebullience as a storyteller is infectious. No sooner does he dry his eyes over the fate of the mammoth, than he is gleefully explaining how easy they were to get rid of. (With that long a gestation period, and that small a herd, you only had to kill a couple of mammoths a year to wipe them out.)

Harari’s concludes that we’re not a very nice species. This is risky, if only because self-hate is cheap and saves us the trouble of doing anything or changing anything about ourselves. The gloomy shade of Jean-Jacques Rousseau hovers over Harari’s dismissal of religion as a means by which powerful hominins cozened an unfair quantity of bananas from their weaker brethren. The idea that religion might be humanity’s millennia-old effort to tell uplifting stories about itself, all in the teeth of cosmic meaninglessness and the inevitability of death, gets no look-in here, though Harari still spends an inordinate amount of time being kind to the blarney and tosh spun by animists and shamans, those snake-oil salesmen of yore.

Harari’s setting us up for a thunderous and inspiring last chapter, in which we see Homo sapiens poised to use its storytelling superpower to more constructive effect.

If thousands of people believe in the same story, then they’ll all follow the same rules, and this is why we rule the world (“whereas poor chimps are locked up in zoos”).

To save the world we have been so busy consuming, we need to come up with a story about ourselves that’s better than the ones we’ve told each other in the past (or, to be less judgemental about it, a story that’s better suited to our planet’s present).

“If you can invent a good story that enough people believe,” Harari writes, “you can conquer the world.”

It is unlikely that this will be written by Harari. Though he’s packaged as a seer, there’s little in his work that is truly surprising or sui generis.

His chief skill — displayed here even more remarkably than in his work for adults — is his ability to spin complex material into a rollicking tale while still telling the truth.

The worst day ever

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Reading Riley Black’s The Last Days of the Dinosaurs for New Scientist, 20 April 2022

Welcome to Hell Creek, in what is now Montana. Readers had best not get too attached to the inhabitants dreamt into being in the first chapter of The Last Days of the Dinosaurs: the Tyrannosaurus rex, “her reddish brown hide now draped in orange and gold from the low-angled light of the evening sun”; the low-slung herbivore Ankylosaurus, defending herself with a tail club the size of a car tyre; the new-born Alamosaurus sanjuanensis chick, that will never get to grow into one of the largest animals to ever walk the Earth.

Tomorrow, a seven-mile-wide meteor will plough into the ancient Yucatán, triggering the extinction of around three quarters of all species on Earth. Along with all non-avian dinosaurs, great batwinged pterosaurs will perish; later, invertebrates like ammonites will stutter and stop in seas made corrosive by acid rain. Most early mammals — those that didn’t go up in flames, or get blasted off into outer space — will eventually starve; and with them, most lizards, snakes, and birds.

Subsequent chapters offer glimpses of the aftermath, each separated by an exponentially longer interval. An hour after impact and in Hell Creek, over 4,500 kilometres away from the impact, a puzzled Ankylosaurus fights for its footing at the edge of a trembling lake. Safe in her burrow, a squirrel-like Mesodma sleeps through a day of pulsing, planetary conflagration. A month in, and little two-toed Acheroraptors are poking about amongst the decaying debris, unaware of the cold and hunger to come.

Time accelerates. A year, a hundred years, a thousand years go by. We venture far from Hell Creek, many times, and learn much about dinosaurs and their long history, about the mechanisms of evolution and climate, and about the deep history of our planet. We learn to abandon old notions of a planet healing itself, or of life returning to some ideal degree of diversity. Mass extinctions are not “opportunities”, and when living designs are lost, in the great game of adaptation and extinction, they stay lost. Life got through by the skin of its teeth.

Hell Creek remains central throughout, as is only reasonable, since its geology appears to record in such extraordinary detail the events immediately following the giant Chicxulub asteroid’s impact. We glimpse it as an Eden, gardened by towering herbivores. We see it go up in flames. We say goodbye to the place as new plants smother and entangle it, creating the jungle environments from which complex behaviours and communities — both primate and avian — will be born. Throughout, the author’s shifting cast of characters remains vivid and charming.

Indeed, it’s as if Black — a palaeontologist and prolific writer, and no doubt familiar to many readers for her Laelaps blog — had set up camp in the very heart of the valley. This is palaeontology written with the immediacy of natural history.

In a long appendix, Black explains what’s real in this book, and what she’s made up. No need to be disconcerted. Without a leavening of intelligent speculation, palaeontologists have never been able to say anything useful. it’s a point Black makes splendidly, with reference to an illustrated study from 1863, The World Before the Deluge.

This book was published just a couple of years after the discovery of the first decent fossilised skeleton of Archaeopteryx — a previously missing link between reptiles and birds. The only problem was the head was missing. “Did Archaeopteryx have a beak? Teeth? Both? Neither? There was no way to answer the question,” Black explains. “And so The World Before the Deluge portrayed Archaeopteryx flying high above Jurassic conifers totally headless.”

Black’s approach is much more sensible, adding to The Last Days of the Dinosaurs whatever she needs — a head here, a behaviour there — to give us living, more-or-less reliable glimpses into the days after the worst day ever suffered by life on Earth.

 

Flame brightly and flame out

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Reading Kindred by Rebecca Wragg Sykes for New Scientist, 19 August 2020

How we began to unpick our species’ ancient past in the late 19th century is an astounding story, but not always a pretty one. As well as attaining tremendous insights into the age of Earth and how life evolved, scholars also entertained astonishingly bad ideas about superiority.

Some of these continue today. Why do we assume that Neanderthals, who flourished for 400,000 years, were somehow inferior to Homo sapiens or less fit to survive?

In Kindred, a history of our understanding of Neanderthals, Rebecca Wragg Sykes separates perfectly valid and reasonable questions – for example, “why aren’t Neanderthals around any more?” – from the thinking that casts our ancient relatives as “dullard losers on a withered branch of the family tree”.

An expert in palaeolithic archaeology, with a special interest in the cognitive aspects of stone tool technologies, Sykes provides an fascinating and detailed picture of a field transformed almost out of recognition over the past thirty years. New technologies involve everything from gene sequencing, isotopes and lasers to powerful volumetric algorithms. Well-preserved sites are now not merely dug and brushed: they are scanned and sniffed. High-powered optical microscopes pick out slice and chop marks, electron beams trace the cross-sections of scratches at the nano-scale, and rapid collagen identification techniques determine the type of animal from even tiny bone fragments.

The risk with any new forensic tool is that, in our excitement, we over-interpret the results it throws up. As Sykes wisely says, “A balance must be struck between caution and not ignoring singular artefacts simply because they’re rare or wondrous.”

Many gushing media stories about our ancient ancestor don’t last beyond the first news cycle: though Neanderthals may have performed some funerary activity, they didn’t throw flowers on their loved ones’ graves, or decorate their remains in any way. Other stories, though, continue to accumulate a weight of circumstantial evidence. We’ve known for some years that some Neanderthals actually tanned leather; now it seems they may also have spun thread.

An exciting aspect of this book is the way it refreshes our ideas about our own place in hominin evolution. Rather than congratulating other species when they behave “like us”, Sykes shows that it is much more fruitful to see how human talents may have evolved from behaviours exhibited by other species. Take the example of art. We may ask whether the circular stone assemblies, discovered in a cave near Bruniquel in southern France in 2016, were meant by their Neaderthal creators as monuments? We may wonder, what is the significance of the Neanderthal handprints and ladder designs painted on the walls of three caves in Spain? In both cases, we’d be asking the wrong questions, Sykes says: While undoubtedly striking, Neanderthal art “might not be a massive cognitive leap for hominins who probably already understood the idea of representation.” Animal footprints are effectively symbols already, and even simple tracking “requires an ‘idealised’ form to be kept in mind.”
Captive chimpanzees, given painting materials, enjoy colouring and marking surfaces, though they’re not in the least bit invested in the end result of their labours. So the significance and symbolism of Neanderthal art may simply be that Neanderthals had fun making it.

The Neanderthals of Kindred are not cadet versions of ourselves. They don’t perform “primitive burials”, and they don’t make “proto-art”. They had their own needs, urges, enjoyments, and strategies for survival.

They were not alone and, best of all, they have not quite vanished. Neanderthal nuclear DNA contains glimmers of very ancient encounters between them and other hominin species. Recent research suggests that interbreeding between Neaderthals and Denisovans, and Neanderthals and and Homo sapiens, was effectively the norm. “Modern zoology’s concept of allotaxa may be more appropriate for what Neanderthals were to us,” Sykes explains. Like modern cattle and yaks, we were closely related species that varied in bodies and behaviours, yet could also reproduce.

Neanderthals were never very many. “”At any point in time,” Sykes says, “there may have been fewer Neanderthals walking about than commuters passing each day through Clapham Common, London’s busiest train station.” With dietary demands that took a monstrous toll on their environment, they were destined to flame brightly and flame out. That doesn’t make them less than thus. It simply makes them earlier.

They were part of our family, and though we carry some part of them inside us, we will never see their like again. This, for my money, is Sykes’s finest achievement. Seeing Neanderthals through her eyes, we cannot but mourn their passing.

Teeth and feathers

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Visiting T. rex: The ultimate predator at the American Museum of Natural History in New York, for New Scientist, 13 March 2019

PALAEONTOLOGY was never this easy. Reach into a bin and pick up a weightless fossil bone hardly smaller than you are. Fling it into the air, in roughly the direction indicated by the glowing orange light. It fixes in place above you with a satisfying click. Add more bones. You are recreating the head of the most fearsome predator known to natural history: Tyrannosaurus rex. Once it is complete, the skull you have made makes this point nicely – by coming after you.

The American Museum of Natural History is 150 years old this year. One of its collectors, Barnum Brown, discovered the first fossil remains of the predator in Montana in 1902. So the museum has made T. rex the subject of its first exhibition celebrating the big anniversary.

The game I was playing, T. rex: Skeleton crew, is also the museum’s first foray into virtual reality. It is a short, sweet, multiplayer game that, if it doesn’t convey much scientific detail, nonetheless gives the viewer a glimpse of the first great puzzle palaeontologists confront: how to put scattered remains together. It also gives a real sense of the beast’s size: a fully grown T. rex (and they could live into their late 20s) was more than 12 metres long and weighed 15 tonnes.

An extended version of this game, for home use, will feature a full virtual gallery tour. It has been put together by the Vive arm of tech firm HTC. Early on, in its project to establish a name in the cultural sector, the company decided not to compete with the digital realm’s top dog, Google Arts & Culture. Google, at least until recently, has tended to brand its efforts quite heavily because it brings a wealth of big data to its projects.

HTC Vive, by contrast, works behind the scenes with museums, cultural organisations and artists to realise relatively modest projects. By letting the client take the lead, it is learning faster than most what the VR medium can do. It cut its teeth on an explorable 3D rendering of Modigliani’s studio in the Tate Modern in London in 2017 and created an immersive exploration of Claude Monet’s approach to painting in The Water Lily Obsession, now a permanent feature at the Musée de l’Orangerie in Paris.

The trick, it seems, is to focus, to make immersion and physical sensation the point of each piece. Above all, the idea is to slow down. VR isn’t a traditional teaching aid. The Monet project in particular revealed how good VR is at conveying craft knowledge.

But if, instead, a VR installation delivers a brief, memorable, even magical experience, this, too, has value. Skeleton crew is a powerful prompt to the imagination. It isn’t, and isn’t meant to be, the star of this show. The models are the real draw here. Traditionally fashioned life-size renderings of tyrannosaurs big and small, scaled, tufted and sometimes fully feathered, their variety reflecting the explosion of palaeobiological research that has transformed our understanding of millions of years of Mesozoic fauna over the past 20 years. We can now track trace chemicals in the material surrounding a fossil so precisely that we even know the colour of some species’ eggs.

T. rex: The ultimate predator certainly delivers on its brash, child-friendly title. Terrifying facts abound. T. rex‘s jaws had a maximum bite force 10 times that of an alligator – enough not just to break bone, but to burst it into swallowable splinters.

But the really impressive thing about the show are the questions it uses to convey the sheer breadth of palaeontology. What did T. rex sound like? No one knows, but here are a mixing desk and some observations about how animals vocalise: go figure. Is this fossil a juvenile T. rex or a separate species? Here is a summary of the arguments: have a think.

Staged in a huge cavern-like hall, with shadow-puppet predators and prey battling for dear life, T. rex: The ultimate predator will wow families. Thankfully, it is also a show that credits their intelligence.

More than human

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For New Scientist: a review of Ian Tattersall’s The Strange Case of the Rickety Cossack, and other cautionary tales from human evolution

THE odd leg bones and prominent brow ridges of a fossil hominid found in Belgium in 1830 clearly belong to an ancient relative of Homo sapiens. But palaeontologist August Mayer wasn’t having that: what he saw were the remains of a man who had spent his life on horseback despite a severe case of rickets, furrowing his brow in agony as a consequence, who hid himself away to die under 2 metres of fossil-laden sediment.

The “Cossack” in Ian Tattersall’s new book, The Strange Case of the Rickety Cossack, exemplifies the risk of relying too much on the opinion of authorities and not enough on systematic analysis. Before they were bureaucratised and (where possible) automated, several sciences fell down that particular well.

Palaeoanthropology made repeated descents, creating a lot of entertaining clatter in the process. For example, Richard Leakey’s televised live spat with Donald Johanson over human origins in 1981 would be unimaginable today. I think Tattersall, emeritus curator at the American Museum of Natural History, secretly misses this heroic age of simmering feuds and monstrous egos.

The human fossil record ends with us. There are many kinds of lemur but, as he writes, only one kind of human, “intolerant of competition and uniquely able to eliminate it”. As a result, there is an immense temptation to see humans as the acme of an epic evolutionary project, and to downplay the diversity our genus once displayed.

Matters of theory rarely disturbed the 20th-century palaeontologists; they assigned species names to practically every fossil they found until biologist Ernst Mayr, wielding insights from genetics, stunned them into embarrassed silence. Today, however, our severely pruned evolutionary tree grows bushier with every molecular, genetic and epigenetic discovery.

Some claim the group of five quite distinct fossil individuals discovered in 1991 in Dmanisi, east of the Black Sea, belong to one species. Use your eyes, says Tattersall; around 2 million years ago, four different kinds of hominid shared that region.

Tattersall explains how epigenetic effects on key genes cascade to produce radical morphological changes in an eye blink, and why our unusual thinking style, far from being the perfected product of long-term selective pressures, was bootstrapped out of existing abilities barely 100,000 years ago.

He performs a difficult balancing act with aplomb, telling the story of human evolution through an accurate and unsparing narrative of what scientists actually thought and did. His humility and generosity are exemplary.