A mural in an ancient tomb in China shows a troupe of eunuchs. How long did they live? Wikimedia Commons hide caption

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Scientists Parse Genes Of Breast Cancer's Four Major Types
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Federally funded chimps at the New Iberia Research Center in Louisiana will retire to either a lab in Texas or a chimp sanctuary in Louisiana. Courtesy of the Humane Society of the United States hide caption

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The genetic factors responsible for a cat's stripes might help researchers understand disease resistance in humans. kennymatic via Flickr hide caption

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Could Genes For Stripes Help Kitty Fight Disease?
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Human chromosomes like these contain genes and lots of other genetic material whose function has been a mystery. National Cancer Institute via AP hide caption

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Scientists Unveil 'Google Maps' For Human Genome
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Research shows that under certain circumstances, we can train ourselves to forget details about particular memories. iStockphoto.com hide caption

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Can We Learn To Forget Our Memories?
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Childhood obesity is on the rise in many countries and overuse of antibiotics is now on the radar as a possible factor in the epidemic. Here 18-month-old twins are weighed in a nutritionist's office in Colombia. Raul Arboleda/AFP/Getty Images hide caption

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The white arrows in these two tumor samples point to a subset of tumor cells that are in a resting state. Nature hide caption

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Lab Findings Support Provocative Theory On Cancer 'Enemy' Within
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Can You Help Me Tie My Shoe? Researchers found that when study participants were asked an unusual request, they were more likely later on to perform a favor. iStockphoto.com hide caption

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Researchers studying brains want to know what's happening in an area called the premotor cortex — the place in the brain that gears up for something the body is about to do, like swimming. Above, Michael Phelps dives off the starting blocks in the final heat of the men's 400-meter individual medley during the 2012 U.S. Olympic Swimming Team Trials in Omaha, Neb., on June 25. Jamie Squire/Getty Images hide caption

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How You Move Your Arm Says Something About Who You Are
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A 3-D model of HIV peeled back to show its layers. HIV's genetic material sits inside a spherical shell (gray matrix) studded with spikes (dark gray and orange). The sphere pops open when a T cell tugs on a spike. Courtesy of Ivan Konstantinov/© Visual Science 2011 hide caption

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