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Category: Biology

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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Theory of predictive brain as important as evolution — an interview with Lars Muckli

Theory of predictive brain as important as evolution — an interview with Lars Muckli

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Our brains make sense of the world by predicting what we will see and then updating these predictions as the situation demands, according to Lars Muckli, professor of neuroscience at the Centre for Cognitive Neuroimaging in Glasgow, Scotland. He says that this predictive processing framework theory is as important to brain science as evolution is to biology. Horizon magazine: You have used advanced brain imaging techniques to come up with a model of how the brain processes vision – and…

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China-backed Sumatran dam threatens the rarest ape in the world

China-backed Sumatran dam threatens the rarest ape in the world

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By Bill Laurance, James Cook University The plan to build a massive hydropower dam in Sumatra as part of China’s immense Belt and Road Initiative threatens the habitat of the rarest ape in the world, which has only 800 remaining members. This is merely the beginning of an avalanche of environmental crises and broader social and economic risks that will be provoked by the BRI scheme. Read more: How we discovered a new species of orangutan in northern Sumatra The…

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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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Why the human brain is so efficient

Why the human brain is so efficient

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Liqun Luo writes: An important difference between the computer and the brain is the mode by which information is processed within each system. Computer tasks are performed largely in serial steps. This can be seen by the way engineers program computers by creating a sequential flow of instructions. For this sequential cascade of operations, high precision is necessary at each step, as errors accumulate and amplify in successive steps. The brain also uses serial steps for information processing. In the…

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Only a tiny fraction of the genes inside our bodies are human

Only a tiny fraction of the genes inside our bodies are human

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James Gallagher writes: Prof Rob Knight, from University of California San Diego, told the BBC: “You’re more microbe than you are human.” Originally it was thought our cells were outnumbered 10 to one. “That’s been refined much closer to one-to-one, so the current estimate is you’re about 43% human if you’re counting up all the cells,” he says. But genetically we’re even more outgunned. The human genome – the full set of genetic instructions for a human being – is…

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Burning coal may have caused Earth’s worst mass extinction

Burning coal may have caused Earth’s worst mass extinction

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Dana Nuccitelli writes: Recently, geologist Dr Benjamin Burger identified a rock layer in Utah that he believed might have formed during the Permian and subsequent Triassic period that could shed light on the cause of the Great Dying [the Earth’s deadliest mass extinction 252 million years ago]. During the Permian, Earth’s continents were still combined as one Pangea, and modern day Utah was on the supercontinent’s west coast. Samples from the end-Permian have been collected from rock layers in Asia,…

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How Lyme disease the first epidemic of climate change

How Lyme disease the first epidemic of climate change

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Mary Beth Pfeiffer writes: In the tally of species that will evolve or perish as temperatures rise, now consider the moose. The lumbering king of the deer family, known for antlers that can span six feet like giant outstretched fingers, the moose faces a litany of survival threats, from wolves and bears to brain worms and liver fluke parasites. But in the late 1990s in many northern states and Canada, something else began to claim adult cows and bull moose…

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The interstitium, the largest organ we never knew we had

The interstitium, the largest organ we never knew we had

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Tanya Basu writes: What is an organ? Anatomy textbooks are rather fuzzy about what defines an “organ,” requiring one to have primary tissue—parenchyma—and “sporadic” tissue, called stroma, which can be nerves, vessels, and other connective tissue. Organs are the necessary building blocks of organisms (hence, the name), and can be gigantic or microscopic. So long as cells clump together to form tissues, and these tissues organize themselves into organs that perform specific functions in the survival of an organism, that…

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How new data is transforming our understanding of place cells — the brain’s GPS

How new data is transforming our understanding of place cells — the brain’s GPS

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Adithya Rajagopalan writes: The first pieces of the brain’s “inner GPS” started coming to light in 1970. In the laboratories of University College London, John O’Keefe and his student Jonathan Dostrovsky recorded the electrical activity of neurons in the hippocampus of freely moving rats. They found a group of neurons that increased their activity only when a rat found itself in a particular location. They called them “place cells.” Building on these early findings, O’Keefe and his colleague Lynn Nadel…

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3.5 billion-year-old fossils challenge ideas about early life on Earth

3.5 billion-year-old fossils challenge ideas about early life on Earth

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Rebecca Boyle writes: In the arid, sun-soaked northwest corner of Australia, along the Tropic of Capricorn, the oldest face of Earth is exposed to the sky. Drive through the northern outback for a while, south of Port Hedlund on the coast, and you will come upon hills softened by time. They are part of a region called the Pilbara Craton, which formed about 3.5 billion years ago, when Earth was in its youth. Look closer. From a seam in one…

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Land degradation by human activities pushing Earth into sixth mass extinction and undermining well-being of 3.2 billion people

Land degradation by human activities pushing Earth into sixth mass extinction and undermining well-being of 3.2 billion people

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  Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES): Worsening land degradation caused by human activities is undermining the well-being of two fifths of humanity, driving species extinctions and intensifying climate change. It is also a major contributor to mass human migration and increased conflict, according to the world’s first comprehensive evidence-based assessment of land degradation and restoration. The dangers of land degradation, which cost the equivalent of about 10% of the world’s annual gross product in 2010 through…

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DNA from more than 900 ancient people trace the prehistoric migrations of our species

DNA from more than 900 ancient people trace the prehistoric migrations of our species

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Carl Zimmer writes: David Reich wore a hooded, white suit, cream-colored clogs, and a blue surgical mask. Only his eyes were visible as he inspected the bone fragments on the counter. Dr. Reich, a geneticist at Harvard Medical School, pointed out a strawberry-sized chunk: “This is from a 4,000-year-old site in Central Asia — from Uzbekistan, I think.” He moved down the row. “This is a 2,500-year-old sample from a site in Britain. This is Bronze Age Russian, and these…

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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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Why moths learn so much faster than machines

Why moths learn so much faster than machines

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Technology Review reports: One of the curious features of the deep neural networks behind machine learning is that they are surprisingly different from the neural networks in biological systems. While there are similarities, some critical machine-learning mechanisms have no analogue in the natural world, where learning seems to occur in a different way. These differences probably account for why machine-learning systems lag so far behind natural ones in some aspects of performance. Insects, for example, can recognize odors after just…

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