In 2009, Burger King launched a campaign that if you unfriended 10 friends on Facebook, you were entitled to a free Whopper. The person you unfriended would get a message telling them that their friendship is worth less than a Whopper.
Alexander the Great encouraged his men to shave so enemies couldn't grab their beards during battles.
One in four Americans thinks that the Sun revolves around the Earth.
The oceans contain 200,000 different kinds of viruses.