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Category: Biology

People’s racial and ethnic identities don’t reflect their genetic ancestry

People’s racial and ethnic identities don’t reflect their genetic ancestry

Live Science reports: The racial and ethnic groups people identify with may not accurately represent their genetic backgrounds or ancestries, a new study of people in the United States suggests. This discrepancy between people’s self-reported identities and their genetics is important for scientists to acknowledge as they strive to develop medical treatments tailored to different patients, the researchers behind the study say. “This paper is very important because it clarifies at the highest resolution the relationship between genomic diversity and…

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Mountain chickadee chatter: Scientists are decoding the songbird’s complex calls

Mountain chickadee chatter: Scientists are decoding the songbird’s complex calls

Mountain chickadees are unusual in having more complex calls than songs. Vladimir Pravosudov By Sofia Marie Haley, University of Nevada, Reno I approach a flock of mountain chickadees feasting on pine nuts. A cacophony of sounds, coming from the many different bird species that rely on the Sierra Nevada’s diverse pine cone crop, fill the crisp mountain air. The strong “chick-a-dee” call sticks out among the bird vocalizations. The chickadees are communicating to each other about food sources – and…

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Chimpanzees are capable of complex communication, new research reveals

Chimpanzees are capable of complex communication, new research reveals

Max Planck Institute for Evolutionary Anthropology: Humans are the only species known to use full language, which involves combining sounds into words and words into structured sentences that convey infinite meanings. This process follows linguistic rules that determine how meaning changes with context. For example, the word “ape” can be used in compositional ways to add meaning—such as “the ape eats” or “big ape”—or in non-compositional idioms like “go ape,” which takes on a new meaning entirely. Syntax, the rule…

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How the universe differs from its mirror image

How the universe differs from its mirror image

Zack Savitsky writes: After her adventures in Wonderland, the fictional Alice stepped through the mirror above her fireplace in Lewis Carroll’s 1871 novel Through the Looking-Glass to discover how the reflected realm differed from her own. She found that the books were all written in reverse, and the people were “living backwards,” navigating a world where effects preceded their causes. When objects appear different in the mirror, scientists call them chiral. Hands, for instance, are chiral. Imagine Alice trying to…

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Humans are killing helpful insects in hundreds of ways − simple steps can reduce the harm

Humans are killing helpful insects in hundreds of ways − simple steps can reduce the harm

Dragonflies, just like bees and butterflies, face threats that humans can help prevent. Christopher Halsch By Christopher Halsch, Binghamton University, State University of New York and Eliza Grames, Binghamton University, State University of New York Insects are all around us – an ant on the sidewalk, a bee buzzing by, a butterfly floating on the breeze – and they shape the world we experience. They pollinate flowering plants, decompose waste, control pests, and are critical links in food chains. Despite…

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Orangutan healed his own wound using a known medicinal plant

Orangutan healed his own wound using a known medicinal plant

Smithsonian magazine reports: In June 2022, a team of researchers observed a behavior never before witnessed in the animal world: A Sumatran orangutan named Rakus self-treated an injury using a medicinal plant. At Gunung Leuser National Park, a rainforest reserve on the western Indonesian island of Sumatra, scientists heard from the treetops a series of “long calls,” a behavior that usually preempts assertions of male dominance or aggression. The next day, they saw Rakus with an open wound on his…

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Vertebrates evolved intelligence independently multiple times

Vertebrates evolved intelligence independently multiple times

Yasemin Saplakoglu writes: Humans tend to put our own intelligence on a pedestal. Our brains can do math, employ logic, explore abstractions and think critically. But we can’t claim a monopoly on thought. Among a variety of nonhuman species known to display intelligent behavior, birds have been shown time and again to have advanced cognitive abilities. Ravens plan for the future, crows count and use tools, cockatoos open and pillage booby-trapped garbage cans, and chickadees keep track of tens of…

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Silent X chromosome genes ‘reawaken’ in older females, potentially boosting brain power, study finds

Silent X chromosome genes ‘reawaken’ in older females, potentially boosting brain power, study finds

Live Science reports: Dormant genes on the X chromosome may reawaken in old age, potentially giving the aging female brain a boost that the male brain doesn’t receive. This phenomenon may help to explain why, on many measures, females show a higher level of cognitive resilience in old age than males do. The findings come from a new study in lab mice, and the researchers also backed up the results with genetic data from humans. More research is still needed…

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How migrating birds use quantum mechanics to navigate

How migrating birds use quantum mechanics to navigate

The Observer reports: To the seasoned ear, the trilling of chiffchaffs and wheatears is as sure a sign of spring as the first defiant crocuses. By March, these birds have started to return from their winter breaks, navigating their way home to breeding grounds thousands of kilometres away – some species returning to home territory with centimetre precision. Although the idea of migration often conjures up striking visions of vast flocks of geese and murmurations of starlings, “the majority,” says…

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How metabolism can shape cells’ destinies

How metabolism can shape cells’ destinies

Viviane Callier writes: Each of us starts life as a single cell. To develop into a complex, multicellular being, that cell must divide, and then those cells must divide again, and again — and then these stem cells start to specialize into different types, with different destinies in our bodies. In the first week, our cells reach their first turning point: They must become either placenta or embryo. Then, in the developing embryo, cells form three primary layers — ectoderm,…

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Bennu asteroid reveals its contents to scientists − and clues to how the building blocks of life on Earth may have been seeded

Bennu asteroid reveals its contents to scientists − and clues to how the building blocks of life on Earth may have been seeded

This photo of asteroid Bennu is composed of 12 Polycam images collected on Dec. 2, 2024, by the OSIRIS-REx spacecraft. NASA By Timothy J McCoy, Smithsonian Institution and Sara Russell, Natural History Museum A bright fireball streaked across the sky above mountains, glaciers and spruce forest near the town of Revelstoke in British Columbia, Canada, on the evening of March 31, 1965. Fragments of this meteorite, discovered by beaver trappers, fell over a lake. A layer of ice saved them…

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The key to a healthy gut microbiome is a healthy diet

The key to a healthy gut microbiome is a healthy diet

Università di Trento: A varied diet rich in vegetables is known to be healthy for one’s well-being. Excessive consumption of meat, especially red meat, can lead to chronic and cardiovascular diseases. That is also because what we eat shapes the gut microbiome. At the same time, excluding certain foods, such as dairy or animal products, is not necessarily a general solution to achieve microbial balance. But can we find out which food products determine differences in the gut microbiome? Starting…

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We all carrying thousands of genetic mistakes accrued over a lifetime

We all carrying thousands of genetic mistakes accrued over a lifetime

Amber Dance writes: You began when egg and sperm met, and the DNA from your biological parents teamed up. Your first cell began copying its newly melded genome and dividing to build a body. And almost immediately, genetic mistakes started to accrue. “That process of accumulating errors across your genome goes on throughout life,” says Phil H. Jones, a cancer biologist at the Wellcome Sanger Institute in Hinxton, England. Scientists have long known that DNA-copying systems make the occasional blunder…

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The ocean is teeming with networks of interconnected bacteria

The ocean is teeming with networks of interconnected bacteria

Veronique Greenwood writes: Prochlorococcus bacteria are so small that you’d have to line up around a thousand of them to match the thickness of a human thumbnail. The ocean seethes with them: The microbes are likely the most abundant photosynthetic organism on the planet, and they create a significant portion — 10% to 20% — of the atmosphere’s oxygen. That means that life on Earth depends on the roughly 3 octillion (or 3 × 1027) tiny individual cells toiling away….

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Scientists re-create the microbial dance that sparked complex life

Scientists re-create the microbial dance that sparked complex life

Molly Herring writes: Far from being solo operators, most single-celled microbes are in complex relationships. In the ocean, the soil and your gut, they might battle and eat each other, exchange DNA, compete for nutrients, or feed on one another’s by-products. Sometimes they get even more intimate: One cell might slip inside another and make itself comfortable. If the conditions are just right, it might stay and be welcomed, sparking a relationship that could last for generations — or billions…

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The extraordinary memories of food-caching birds

The extraordinary memories of food-caching birds

Matthew Hutson writes: A while ago, I searched for a beard trimmer in my bedroom. I spent probably forty-five minutes looking in every likely location at least twice, and every unlikely location at least once. I swore up a storm; the trimmer never turned up. I’ve played similar games with pants. There’s a reason for the burgeoning market in electronic tags that track your belongings. Our poor memories can seem mystifying, especially when you consider animals. This time of year,…

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