The only king without a mustache in a deck of cards is the King of Hearts Contrary to popular belief, one in four cowboys were actually black. Around 39% of humans have an extra small bone behind their knee called a fabella. When animals sleep through a cold period it's called hibernation, but when animals sleep through a hot period it's called estivation. The capital of Brazil, Brasilia, was built in just under four years, from 1956 to 1960. Rio had been the capital for almost 200 years prior to that. The world's largest swimming pool is in Algarrobo, Chile and measures over 1,000 yards from end to end. That's 10 football fields!