Have you ever asked or shouted this question? Read the Pulitzer Prize-winning article by Gene Weingarten on the subject published in 2009 in the Washington Post. Every parent or anyone who cares for children – and anyone who has ever asked this question should read this story.
http://www.washingtonpost.com/wp-dyn/content/discussion/2009/03/04/DI2009030402198.html