AAAS Member Alan Alda's Flame Challenge: What Is Time?

Actor Alan Alda is challenging scientists once again to answer a basic science question in language that will engage and enlighten 11-year-olds. He and the Stony Brook University Center for Communicating Science have launched the second edition of the Flame Challenge, sponsored by AAAS and the American Chemical Society.

The question for this year's contest, selected from 300 submissions by children, is: "What is time?" Scientists have until 1 March 2013 to submit their answers in writing, video, or graphics.

Find out more here.