Alan Alda's science contest asks: What is color?
FILE - In this April 26, 2013 file photo, actor and sometimes science professor Alan Alda addresses a Communicating Science class on the campus of Stony Brook University, on New York's Long Island. Alan Alda is now posing the question "How do you explain color to an 11-year-old?," to scientists around the world. It’s part of a contest he started three years ago called the “Flame Challenge,” to encourage scientists to find better ways of clearly explaining how science works to the general public. (AP Photo/Richard Drew, File)