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Kerri De Nies plays with her son, Gregory Mac Phee at their home in San Diego. Gregory tested positive for adrenoleukodystrophy, a rare brain disorder that affects 1 in about 18,000 babies. About 30 percent of boys with the genetic mutation go on to develop the most serious form of the disease. Anna Gorman/KHN hide caption

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Anna Gorman/KHN

Parents Lobby States To Expand Newborn Screening Test For Rare Brain Disorder

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Alzheimer's disease causes atrophy of brain tissue. The discovery that lymph vessels near the brain's surface help remove waste suggests glitches in the lymph system might be involved in Alzheimer's and a variety of other brain diseases. Alfred Pasieka/Science Source hide caption

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Alfred Pasieka/Science Source

Brain's Link To Immune System Might Help Explain Alzheimer's

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Nobel Prize Came Quickly For 3 Physicists Who Discovered Gravitational Waves

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Einstein realized that if masses moved about, the deformations in space would also move about, propagating like waves, somewhat like what happens when you throw a rock on a pond. But, gravity being such a weak force, the effect is truly tiny and needs something very dramatic to create a signal we can detect here. This is exactly what was found by LIGO and the Nobel winners. traveler1116/Getty Images hide caption

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Nobel Committee for Physics members announce the 2017 Nobel Prize winners at the Royal Swedish Academy of Sciences in Stockholm. The laureates are (from left) Rainer Weiss, Barry C. Barish and Kip S. Thorne. Jonathan Nackstrand/AFP/Getty Images hide caption

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Jonathan Nackstrand/AFP/Getty Images

3 Americans Win 2017 Nobel Prize In Physics

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Can A Child Be Raised Free Of Gender Stereotypes? This Family Tried

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3 Americans Win Nobel In Medicine For Circadian Rhythm Research

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Winners of the 2017 Nobel Prize in Physiology or Medicine were shown on a screen at Monday's announcement. From left to right: Jeffrey C. Hall, Michael Rosbash and Michael W. Young. Jonathan Nackstrand/AFP/Getty Images hide caption

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Elon Musk Lays Out His Mars Colony Plans

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Chris Tuan tested conductive concrete on a 150-foot bridge near Lincoln, Neb., where he says it successfully de-iced the surface. University of Nebraska-Lincoln University Communications hide caption

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University of Nebraska-Lincoln University Communications

The Voyager Golden Record remained mostly unavailable and unheard, until a Kickstarter campaign finally brought the sounds to human ears. Ozma Records/LADdesign hide caption

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Ozma Records/LADdesign

The Voyager Golden Record Finally Finds An Earthly Audience

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What Would Aliens Make Of NASA's Voyager?

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Flooded houses near Lake Houston on Aug. 30, after the storm called Harvey swept through. Sociologist Clare Cooper Marcus says our homes hold our emotional history — our memories, our hopes, our dreams and pain. In some ways our homes are who we are. Win McNamee/Getty Images hide caption

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Animals, Plants Rafted Across The Pacific After Japan's 2011 Earthquake

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Patrick Bayou, pictured on Sept. 2, flooded when Hurricane Harvey slammed the Houston area. The bayou is a Superfund toxic waste site. A March cleanup report for the site did not include preparations for more severe flood events as a result of climate change. Jason Dearen/AP hide caption

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Jason Dearen/AP