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The Allen Institute for Brain Science hosted its first BigNeuron Hackathon in Beijing earlier this month. Similar events are planned for the U.S. and U.K. Courtesy of Allen Institute for Brain Science hide caption

itoggle caption Courtesy of Allen Institute for Brain Science

There's a widely held assumption that a slight imbalance in male births has its start at the very moment of conception. But researchers say factors later in pregnancy are more likely to explain the phenomenon. CNRI/Science Source hide caption

itoggle caption CNRI/Science Source

NPR senior Washington editor Beth Donovan walks on a treadmill desk in her office in Washington, D.C. Meredith Rizzo/NPR hide caption

itoggle caption Meredith Rizzo/NPR

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Olympic gold medalist Sanya Richards-Ross pulls on compression sleeves before a 400-meter race at the World Indoor Athletics Championships in Istanbul in 2012. Martin Meissner/AP hide caption

itoggle caption Martin Meissner/AP

Melinda Townsend-Breslin holds a photo showing her and her mother standing in the parking lot of a favorite thrift store in 2013. William DeShazer for NPR hide caption

itoggle caption William DeShazer for NPR

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

itoggle caption Centre For Infections/Health Pro/Science Photo Library/Getty Images

When combined with results of other neurological tests, and in the context of a thorough medical history, atrophy of the brain (shown here in an MRI scan) sometimes indicates Alzheimer's. Simon Fraser/Science Source hide caption

itoggle caption Simon Fraser/Science Source

Laury Sacks and her husband, Eric. The actress and writer developed frontotemporal dementia in her late 40s and died in 2008 at age 52. Courtesy of Eric Sacks hide caption

itoggle caption Courtesy of Eric Sacks

Jonathan Keleher talks with a colleague, Rafael Wainhaus, at work. Keleher was born without a cerebellum, but his brain has developed work-arounds for solving problems of balance and abstract thought. Ellen Webber for NPR hide caption

itoggle caption Ellen Webber for NPR

Jonathan Keleher is one of a handful of people who have lived their entire lives without a cerebellum. Ellen Webber for NPR hide caption

itoggle caption Ellen Webber for NPR

Patient perceptions have been tough to change at Rowan Regional Medical Center in Salisbury, N.C. Joanna Serah/Wikimedia hide caption

itoggle caption Joanna Serah/Wikimedia

Kristen Caminiti cuddles her son Connor while doctors stitch her up following a C-section. Courtesy of Kristen DeBoy Caminiti hide caption

itoggle caption Courtesy of Kristen DeBoy Caminiti

Greg and Mary Catherine O'Brien with their kids, at daughter Colleen's marriage to Matt Everett last August. Greg has early-onset Alzheimer's. From left, Brendan O'Brien, Greg O'Brien, Colleen O'Brien, Matt Everett, Mary Catherine O'Brien, and Conor O'Brien. Courtesy of Greg O'Brien hide caption

itoggle caption Courtesy of Greg O'Brien