Jason DaSilva was on a family vacation in 2006 when he fell and couldn't get up. His multiple sclerosis symptoms have progressed to the point that he can't walk. Factory Release hide caption

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A collage of family photos of Melissa Sherak Glasser. Mark Turner for NPR hide caption

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French multiple sclerosis sufferer Marc Kopp speaks about his quest to skydive over Mount Everest, in an interview conducted in Kathmandu last week. Prakash Mathema/AFP/Getty Images hide caption

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Spring has brought the stork and a baby who just might have a higher risk for multiple sclerosis later in life. Anna Bryukhanova/iStockphoto.com hide caption

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Moshe Rute smokes marijuana at the Hadarim nursing home in Kibutz Naan, Israel, in early March. The Israeli government and a private company are distributing cannabis for medicinal purposes to more than 1,800 people in Israel. Uriel Sinai/Getty Images hide caption

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