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Emotion seemed to fuel plenty of sighs by Humphrey Bogart's character Rick (right) in the 1942 film classic Casablanca, and even Rick's good friend Sam, played by actor Dooley Wilson, couldn't console him. Archive Photos/Getty Images hide caption

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Archive Photos/Getty Images

When so-called senescent cells were removed from mice, they were healthier and lived longer than mice that still had the cells. Philippe Merle/AFP/Getty Images hide caption

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Philippe Merle/AFP/Getty Images

Boosting Life Span By Clearing Out Cellular Clutter

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The stomach of Oetzi, who was mummified in ice, was home to bacteria that scientists were able to identify. The same species lives in the gut of many modern humans. EURAC/Marion Lafogler hide caption

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EURAC/Marion Lafogler

Stomach Of Ancient Iceman Held Microbes Like Ours

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The Middle East respiratory syndrome coronavirus, which causes MERS, is one of the microbes that has sparked research controversy. NIAID/CDC hide caption

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NIAID/CDC

Debate Over Bird Flu Research Moratorium Flares Up Again

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Editing DNA has never been easier. Pasieka/Science Photo Library/Corbis hide caption

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Pasieka/Science Photo Library/Corbis

Gene Editing Tool Hailed As A Breakthrough, And It Really Is One

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While serving in Congress, Jay Dickey sponsored legislation that effectively restricts spending for research on firearms deaths. Spencer Tirey/AP hide caption

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Spencer Tirey/AP

Congress Still Limits Health Research On Gun Violence

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Chris Nickels for NPR

A Controversial Rewrite For Rules To Protect Humans In Experiments

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An image from the Allen Institute's Brain Explorer shows gene expression across the human brain. Courtesy of Allen Institute For Brain Science hide caption

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Courtesy of Allen Institute For Brain Science

A Genetic Map Hints At What Makes A Brain Human

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Human stem cells, in this case made from adult skin cells, can give rise to any sort of human cell. Some scientists would like to insert such cells into nonhuman, animal embryos, in hopes of one day growing human organs for transplantation. Science Source hide caption

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Science Source

Should Human Stem Cells Be Used To Make Partly Human Chimeras?

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