UCLA Study Finds Cells That Become Sperm or Eggs in Humans are Vulnerable During Pregnancy

UCLA scientists examining causes of human infertility have found that the cells that create eggs or sperm during the prenatal stage of development are vulnerable to damage, according to new research published today. The study by Amander Clark, of the UCLA Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, was published in the journal Cell. Clark…

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How Birds Got Their Beaks

When birds got their wings, they lost the clawed fingers wielded by their dinosaur relatives. But they evolved a new “finger”—in their face. And what a boon that has been. Agile beaks of all shapes and sizes, from the gulping gape of a pelican to the needle nose of a hummingbird, have enabled the 10,000 avian species to thrive from…

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Resistance to Antibiotics Found in Isolated Amazonian Tribe

When scientists first made contact with an isolated village of Yanomami hunter-gatherers in the remote mountains of the Amazon jungle of Venezuela in 2009, they marveled at the chance to study the health of people who had never been exposed to Western medicine or diets. But much to their surprise, these Yanomami’s gut bacteria have already evolved a diverse array…

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How The Wolf Became The Dog

Scientists who study canine origins seem to fight about everything: where dogs arose, when this happened, and even the best way to find these answers. But there’s one thing most of them agree on: how dogs became domesticated. Still, it’s taken almost a century to get here, and the details are still emerging. So what did happen? Most experts now think dogs…

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Chimps That Hunt Offer a New View on Evolution

Studies of hunters and gatherers — and of chimpanzees, which are often used as stand-ins for human ancestors — have cast bigger, faster and more powerful males in the hunter role. Now, a 10-year study of chimpanzees in Senegal shows females playing an unexpectedly big role in hunting and males, surprisingly, letting smaller and weaker hunters keep their prey. The results do…

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