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! Around 39% of humans have an extra small bone behind their knee called a fabella. The cost of raising a child from birth to age 18 is around $233,610. Pope Gregory IX was apparently a dog person, because he tried to exterminate all cats from Europe. The oldest university in North America was founded in 1551. It's the National University of Mexico, founded by King Charles I of Spain. Astronauts report that space has sort of a "hot metal" smell, similar to seared steak.