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Karen Kaplan
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For the science lover on your list who has everything: A handwritten page from Darwin's manuscript of "On the Origin of Species." Auction occurs on Thursday. Starting bid is $675K,000. 

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Bonobos can’t read. But if they could, they would need reading glasses when they hit middle age — just like us. Considering that bonobos (along with chimpanzees) are our closest living relatives, perhaps this shouldn’t come as a huge surprise. Still, the scientists who made this discovery say it may help them understand why humans live so long after our reproductive years end.

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“It does raise interesting questions about the level of cognitive complexity — how intelligent a hominin has to be in order to produce what we thought was a sophisticated technology,” said lead author Tomos Proffitt, a paleoanthropologist at Oxford University.

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Would you dine on roasted vole? How about a wood mouse? If you lived in Stone Age Scotland, the answer might have been yes. “Maybe because they are not currently a food source in Europe, no one ever thought to ask if they had been in the past,” said Jeremy Herman, a biologist at the National Museums of Scotland in Edinburgh. 

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When a tomato’s environment drops below 68 degrees, the genes responsible for making it taste like a tomato get turned off. “Basically, the tomato gets cold and tells itself to stop making these aroma compounds,” said Denise Tieman, a research associate professor at the Plant Innovation Center at the University of Florida in Gainesville. “The change is irreversible,” she added.

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The most sought-after drug in the Ebola crisis failed to prove it helped patients. The main reason -- there weren't enough sick people to test it in a randomized clinical trial. 

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Why are people so excited about CRISPR? Because the gene-editing tool has the potential to fix mutations that make people sick. Here's how it could cure sickle cell disease:

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Can the world tax its way out of health problems like obesity and diabetes? The World Health Organization thinks so. Based on studies in multiple countries, officials conclude that a tax that raises the price of sugary drinks by 20% to 50% would discourage consumption. That means fewer calories, and less weight gained. 
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