Alan Alda Challenges Scientists to Answer: What Is Sleep? by SciFri published on 2014-12-12T22:25:20Z More info at http://scifri.me/pshrqx Actor Alan Alda created the “Flame Challenge” in 2012 to promote better science communication. Each year, he asks scientists to explain a question that keeps them up at night to 11-year-olds around the world, who choose the winning entry. This year’s question: What is sleep? Genre Science