As David Letterman signs off from the "Late Show" for the last time, take a look back at memorable late night hosts through the years.
Steve Allen -- "Tonight Starring Steve Allen" (September 1954-January 1957, NBC)
Many foods that you think have health benefits may hold hidden dangers for your diet.
Kevin Winter/Getty Images
Think you're the only one having a bad hair day? You're not alone. There are plenty of celebrities that have had them, too.