A lucky few stay healthy despite carrying genetic defects linked to serious diseases. What protects them? Leigh Wells/Getty Images/Ikon Images hide caption

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How Do 'Genetic Superheroes' Overcome Their Bad DNA?
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Rough night? Depending on specific tweaks to their genes, some fruit flies have trouble falling asleep, and others can't stay asleep. Getting too little shut-eye hurts their memory. David M. Phillips/Science Source hide caption

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How Research On Sleepless Fruit Flies Could Help Human Insomniacs
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The area around the confluence of the Silverthrone and Klinaklini glaciers in southwestern British Columbia provides a glimpse into how the terrain traveled by Native Americans in Pleistocene times may have appeared. David J. Meltzer/Science hide caption

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2 Gene Studies Suggest First Migrants To Americas A Complex Mix
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Mammoths had a distinctive version of a gene known to play a role in sensing outside temperature, moderating the biology of fat and regulating hair growth. That bit of DNA likely helped mammoths thrive in cold weather, scientists say. Courtesy of Giant Screen Films, 2012 D3D Ice Age, LLC/Penn State University hide caption

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Checking DNA Against Elephants Hints At How Mammoths Got Woolly
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This clay facial reconstruction of Kennewick Man, who died about 8,500 years ago in what's now southeast Washington, was based on forensic scientists' study of the morphological features of his skull. Brittney Tatchell/Smithsonian Institution hide caption

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DNA Confirms Kennewick Man's Genetic Ties To Native Americans
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This fungus among us — baker's yeast, aka Saccharomyces cerevisiae — is useful for more than just making bread. iStockphoto hide caption

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You And Yeast Have More In Common Than You Might Think
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Psyched that it's finally spring? Shifts in the season may affect more than your mood. Corbis hide caption

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Seasons May Tweak Genes That Trigger Some Chronic Diseases
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Critics Lash Out At Chinese Scientists Who Edited DNA In Human Embryos
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For someone 2.5 inches shorter than average, the risk of coronary artery disease increases by about 13.5 percent, scientists found. PW Illustration/Ikon Images/Corbis hide caption

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Link Between Heart Disease And Height Hidden In Our Genes
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The H1N1 swine flu virus kills some people, while others don't get very sick at all. A genetic variation offers one clue. Centre For Infections/Health Pro/Science Photo Library/Getty Images hide caption

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The size of the brain of a chimpanzee (right) is considerably smaller than that of a human brain. Probably multiple stretches of DNA help determine that, geneticists say. Science Photo Library/Corbis hide caption

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Just A Bit Of DNA Helps Explain Humans' Big Brains
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Combining The DNA Of Three People Raises Ethical Questions
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