I'm posting one puzzle, riddle, math, or statistical problem a day. Try to answer each one and post your answers in the comments section. I'll post the answer the next day. Even if you have the same answer as someone else, feel free to put up your answer, too!
Tuesday, April 22, 2008
Live When There is Light
I can only live when there is light, but I die if the light shines on me. What am I?