Gold miners working in the Yukon regularly find ancient ground squirrel burrows throughout the permafrost, many containing fossilized feces. Researchers analyzing these well-preserved poop piles found they contain some of the oldest DNA ever recovered, dating from 30,000 to 700,000 years ago. Tucked inside were traces of a wide range of ancient animals, including woolly mammoths, grasshoppers, steppe bison, ancient horses, American cheetahs, as well as hundreds of plant species.PLUS:<ul><li>‘Super-good, ice-making microbes’ may trigger snow and rain, or help freeze food</li><li>We’re a hotbed of mutations, and scientists are leveraging that for our health</li><li>Going out on a limb. Animals regrow body parts, maybe we can too</li><li>From the archives: Isaac Asimov on human creativity and robots</li></ul>

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Fossilized squirrel poop full of ancient animals, and more…

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