FILE - In this April 26, 2013 file photo, actor and sometimes science professor Alan Alda speaks during an interview 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)