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.
The loudest animal on earth is the sperm whale.
There's a "floating rainforest" in the sea.
The chance of a coin landing heads-up is not 50-50