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Category: Evolution

Should evolution treat our microbes as part of us?

Should evolution treat our microbes as part of us?

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Jonathan Lambert writes: Twilight falls on the Tanzanian plain. As the sky turns a deeper purple, a solitary spotted hyena awakens. She trots along the border of her clan’s territory, marking the boundary with a sour paste from under her tail. She sniffs a passing breeze for hints of itinerant males interested in mating, giving little attention to her stomach’s rumbling over the remnants of the previous night’s hunt or the itch on her flank. The lone hyena chooses what…

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Does language spring from the things it describes?

Does language spring from the things it describes?

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Mark Vernon writes: In conversation at the Hay Festival in Wales this May, the English poet Simon Armitage made an arresting observation. Discussing the nature of language and why it is so good at capturing the experience of being alive, he said: ‘My feeling is that a lot of the language that we use, and the best language for poetry, comes directly out of the land.’ Armitage was placing himself within the Romantic tradition’s understanding of the origins of language,…

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A tiny change in brain organization without which humans never could have evolved

A tiny change in brain organization without which humans never could have evolved

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Douglas Fox writes: Suzana Herculano-Houzel spent most of 2003 perfecting a macabre recipe—a formula for brain soup. Sometimes she froze the jiggly tissue in liquid nitrogen, and then she liquefied it in a blender. Other times she soaked it in formaldehyde and then mashed it in detergent, yielding a smooth, pink slurry. Herculano-Houzel had completed her Ph.D. in neuroscience several years earlier, and in 2002, she had begun working as an assistant professor at the Federal University of Rio de…

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The first animal genus defined purely by genetic characters represents a new era for classifying animals

The first animal genus defined purely by genetic characters represents a new era for classifying animals

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Charlie Wood writes: The world’s simplest known animal is so poorly understood that it doesn’t even have a common name. Formally called Trichoplax adhaerens for the way it adheres to glassware, the amorphous blob isn’t much to look at. At just a few millimeters across, the creature resembles a squashed sandwich in which the top layer protects, the bottom layer crawls, and the slimy stuffing sticks it all together. With no organs and just a handful of cell types, the…

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The microbiologist who fundamentally changed the way we think about evolution and the origins of life

The microbiologist who fundamentally changed the way we think about evolution and the origins of life

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David Quammen writes: On Nov. 3, 1977, a new scientific revolution was heralded to the world — but it came cryptically, in slightly confused form. The front page of that day’s New York Times carried a headline: “Scientists Discover a Form of Life That Predates Higher Organisms.” A photograph showed a man named Carl R. Woese, a microbiologist at the University of Illinois in Urbana, with his feet up on his office desk. He was 50ish, with unruly hair, wearing…

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The new story of humanity’s origins in Africa

The new story of humanity’s origins in Africa

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Ed Yong writes: There is a decades-old origin story for our species, in which we descended from a group of hominids who lived somewhere in Africa around 200,000 years ago. Some scientists have placed that origin in East Africa; others championed a southern birthplace. In either case, the narrative always begins in one spot. Those ancestral hominids, probably Homo heidelbergensis, slowly accumulated the characteristic features of our species—the rounded skull, small face, prominent chin, advanced tools, and sophisticated culture. From…

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Mice don’t know when to let it go, either

Mice don’t know when to let it go, either

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Erica Goode reports: Suppose that, seeking a fun evening out, you pay $175 for a ticket to a new Broadway musical. Seated in the balcony, you quickly realize that the acting is bad, the sets are ugly and no one, you suspect, will go home humming the melodies. Do you head out the door at the intermission, or stick it out for the duration? Studies of human decision-making suggest that most people will stay put, even though money spent in…

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What enabled animal life to get more complex and diverse during the Cambrian explosion?

What enabled animal life to get more complex and diverse during the Cambrian explosion?

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Jordana Cepelewicz writes: When Emma Hammarlund of Lund University in Sweden first reached out to her colleague Sven Påhlman for help with her research, he was skeptical he’d have much insight to offer. He was a tumor biologist, after all, and she was a geobiologist, someone who studied the interplay between living organisms and their environment. Påhlman didn’t see how his work could possibly inform her search for answers about the rapid proliferation and diversification of animal life that, half…

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Tiny brains of extinct human relative had complex features

Tiny brains of extinct human relative had complex features

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The New York Times reports: What makes humans so smart? For a long time the answer was simple: our big brains. But new research into the tiny noggins of a recently discovered human relative called Homo naledi may challenge that notion. The findings, published Monday, suggest that when it comes to developing complex brains, size isn’t all that matters. In 2013 scientists excavating a cave in South Africa found remains of Homo naledi, an extinct hominin now thought to have…

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Evolution tracks predictable ways of being

Evolution tracks predictable ways of being

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Ed Yong writes: Most people go to Hawaii for the golden beaches, the turquoise seas, or the stunning weather. Rosemary Gillespie went for the spiders. Situated around 2,400 miles from the nearest continent, the Hawaiian Islands are about as remote as it’s possible for islands to be. In the last 5 million years, they’ve been repeatedly colonized by far-traveling animals, which then diversified into dozens of new species. Honeycreeper birds, fruit flies, carnivorous caterpillars … all of these creatures reached…

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We reconstructed the genome of the ‘first animal’

We reconstructed the genome of the ‘first animal’

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Shutterstock By Jordi Paps, University of Essex The first animals emerged on Earth at least 541m years ago, according to the fossil record. What they looked like is the subject of an ongoing debate, but they’re traditionally thought to have been similar to sponges. Like today’s animals, they were made up of many, many different cells doing different jobs, programmed by thousands of different genes. But where did all these genes come from? Was the emergence of animals a small…

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Are we smart enough to know how smart animals are?

Are we smart enough to know how smart animals are?

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Frans de Waal asks: are we smart enough to know how smart animals are? Just as attitudes of superiority within segments of human culture are often expressions of ignorance, humans collectively — especially when subject to the dislocating effects of technological dependence — tend to underestimate the levels of awareness and cognitive skills of creatures who live mostly outside our sight. This tendency translates into presuppositions that need to be challenged by what de Waal calls his “cognitive ripple rule”:…

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Neanderthals developed art earlier than modern humans

Neanderthals developed art earlier than modern humans

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Carl Zimmer writes: The two new studies don’t just indicate that Neanderthals could make cave art and jewelry. They also establish that Neanderthals were making these things long before modern humans — a blow to the idea that they simply copied their cousins. The earliest known cave paintings made by modern humans are only about 40,000 years old, while Neanderthal cave art is at least 24,000 years older. The oldest known shell jewelry made by modern humans is about 70,000…

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