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Category: Biology

Everyday noises are making our brains noisier

Everyday noises are making our brains noisier

Nina Kraus writes: Take a walk on a busy avenue and you hear either traffic whizzing by or creeping in a honk-laden crawl. Add the hissing of pneumatic bus brakes, distant sirens, the boom-boom of overloud car stereos, the occasional car alarm, music coming from shops you pass, the beeping of a reversing delivery truck. All are part of the fabric of city life. These sounds do not meet or exceed the generally accepted threshold of “unsafe.” They are not…

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Spiders are much smarter than you think

Spiders are much smarter than you think

By Betsy Mason People tend to associate intelligence with brain size. And as a general guideline, this makes sense: more brain cells, more mental capabilities. Humans, and many of the other animals we’ve come to think of as unusually bright, such as chimpanzees and dolphins, all have large brains. And it’s long been assumed that the smallest brains simply don’t have the capacity to support complex mental processes. But what if they do? The vast majority of Earth’s animal species are…

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The secret lives of cells — as never seen before

The secret lives of cells — as never seen before

Nature reports: For a few weeks in 2017, Wanda Kukulski found herself binge-watching an unusual kind of film: videos of the insides of cells. They were made using a technique called cryo-electron tomography (cryo-ET) that allows researchers to view the proteins in cells at high resolution. In these videos, she could see all kinds of striking things, such as the inner workings of cells and the compartments inside them, in unprecedented detail. “I was so overwhelmed by the beauty and…

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The study of the mind needs a Copernican shift in perspective

The study of the mind needs a Copernican shift in perspective

Pamela Lyon writes: In On the Origin of Species (1859), Charles Darwin draws a picture of the long sweep of evolution, from the beginning of life, playing out along two fundamental axes: physical and mental. Body and mind. All living beings, not just some, evolve by natural selection in both ‘corporeal and mental endowments’, he writes. When psychology has accepted this view of nature, Darwin predicts, the science of mind ‘will be based on a new foundation’, the necessarily gradual…

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Primate memory

Primate memory

Tetsuro Matsuzawa writes: The most recent common ancestor of chimpanzees and humans lived between five and seven million years ago. This shared heritage became evident when sequencing revealed a 1.2% DNA difference between species. Chimpanzees have a living sister species, bonobos, that is equally closely related to humans. Both chimpanzees and bonobos are found only in Africa; this is also true of gorillas. Chimpanzees and humans shared a common ancestor with gorillas between eight and nine million years ago. Another…

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Flatworms can reproduce ripping themselves in half

Flatworms can reproduce ripping themselves in half

Ed Yong writes: When planarian flatworms want to reproduce, some have sex. Others, more straightforwardly, tear themselves in two. The latter option is fast and violent. The planarian begins as a small, flattened, sluglike creature with a spade-shaped head and two googly eyes. After a few minutes of stretching and ripping, it separates into two halves—a head and a tail. Within days, the head piece grows a tail. And even more miraculously, the tail regrows its head. “It’s just mind-blowing,”…

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The act of smelling

The act of smelling

Jude Stewart writes: If all our genius lies in our nostrils, as Nietzsche remarked, the nose is an untrained genius, brilliant but erratic. The human nose can detect a dizzying array of smells, with a theoretical upper limit of one trillion smells—yet many of us are incapable of describing these smells in words more precise than smelly and fragrant. Our auditory and visual receptors offer little mystery—they were mapped and explained by scientists many decades ago—but human olfactory receptors were…

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How memories persist where bodies and even brains do not

How memories persist where bodies and even brains do not

Thomas R Verny writes: I began exploring the concept of cellular memory – the idea that memory can be stored outside the brain, in all the body’s cells – after reading an article on Reuters headlined ‘Tiny Brain No Obstacle to French Civil Servant’ in 2007. It seems that a 44-year-old French man had gone to hospital complaining of a mild weakness in his left leg. Doctors learned that the patient ‘had a shunt inserted into his head to drain…

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DNA offers surprises on how Polynesia was settled

DNA offers surprises on how Polynesia was settled

Science reports: The peopling of Polynesia was a stunning achievement: Beginning around 800 C.E., audacious Polynesian navigators in double-hulled sailing canoes used the stars and their knowledge of the waves to discover specks of land separated by thousands of kilometers of open ocean. Within just a few centuries, they had populated most of the Pacific Ocean’s far-flung islands. Now, researchers have used modern DNA samples to trace the exploration in detail, working out what order the islands were settled in…

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The new science on how we burn calories

The new science on how we burn calories

Kim Tingley writes: It’s simple, we are often told: All you have to do to maintain a healthy weight is ensure that the number of calories you ingest stays the same as the number of calories you expend. If you take in more calories, or energy, than you use, you gain weight; if the output is greater than the input, you lose it. But while we’re often conscious of burning calories when we’re working out, 55 to 70 percent of…

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How synchronous firefly flashes illuminate the physics of complex systems

How synchronous firefly flashes illuminate the physics of complex systems

Orit Peleg writes: In the still of the Tennessee night, my colleagues and I are watching thousands of dim little orbs of light, moving peacefully in the forest around us. We try to guess where the next flash will appear, but the movements seem erratic, even ephemeral. This summer, as we set up our cameras and tents, I feel a crippling sense of dread. I had brought us all up here to the Great Smoky Mountains National Park, an unlikely…

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A quantitative theory unlocks the mysteries of why we sleep

A quantitative theory unlocks the mysteries of why we sleep

Van Savage and Geoffrey West write: Humans have long wondered why we sleep. A well-rested prehistoric mind probably pondered the question, long before Galileo thought to predict the period of the pendulum or to understand how fast objects fall. Why must we put ourselves into this potentially endangering state, one that consumes about a third of our adult lives and even more of our childhood? And we don’t do it grudgingly – why do we, along with dogs, lions and…

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Human gut bacteria could be accumulating our medications without our understanding the impact

Human gut bacteria could be accumulating our medications without our understanding the impact

Science Alert reports: When we take medicine, there are often unintended consequences. In the most common scenarios, these are known as side effects. But ‘side effects’ don’t begin to encompass the multitude of strange things that can happen when various compounds enter our system. Sometimes, these unintended consequences occur after drugs physically exit the body, with medicine finding a second life in animals accidentally exposed to the formulations downstream. Yet even before drugs have a chance to leave your body,…

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Having a concept of death is far from being a uniquely human attribute

Having a concept of death is far from being a uniquely human attribute

Susana Monsó writes: Humans have long thought of themselves as the only animal with a notion of mortality. Our concept of death is one of those characteristics, like culture, rationality, language or morality, that have traditionally been taken as definitional of the human species – setting us apart from the natural world and justifying our boundless use and exploitation of it. However, as I have argued elsewhere, the widespread notion that only humans can understand death stems from an overly…

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A new company with a wild mission: Bring back the woolly mammoth

A new company with a wild mission: Bring back the woolly mammoth

Carl Zimmer reports: A team of scientists and entrepreneurs announced on Monday that they have started a new company to genetically resurrect the woolly mammoth. The company, named Colossal, aims to place thousands of these magnificent beasts back on the Siberian tundra, thousands of years after they went extinct. “This is a major milestone for us,” said George Church, a biologist at Harvard Medical School, who for eight years has been leading a small team of moonlighting researchers developing the…

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On the evidence for fungal intelligence

On the evidence for fungal intelligence

Nicholas P Money writes: Mushrooms and other kinds of fungi are often associated with witchcraft and are the subjects of longstanding superstitions. Witches dance inside fairy rings of mushrooms according to German folklore, while a French fable warns that anyone foolish enough to step inside these ‘sorcerer’s rings’ will be cursed by enormous toads with bulging eyes. These impressions come from the poisonous and psychoactive peculiarities of some species, as well as the overnight appearance of toadstool ring-formations. Given the…

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