The genetic mutation that causes Down syndrome increases the risk of intellectual disabilities, and an early death from autoimmune diseases and pneumonia. But it also protects from some cancers, and it often leads to people valued for their kindness and joy. Recently, researchers discovered a major clue as to why the genetic disorder does these things: The mutation increases inflammation. Shelley Schlender explains how this knowledge may lead to healthier lives for those with Down syndrome.Camera: Shelley Schlender 
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