1) The longest-running TV show in history is "The Simpsons," which has been on the air since 1989 and has over 700 episodes.

2) The fingerprints of koalas are so similar to humans that they have been mistaken at crime scenes.

3) The largest known dinosaur, Argentinosaurus, weighed around 70-100 tons and measured up to 100 feet in length.

4) The Age of Exploration, during the 15th and 16th centuries, saw European explorers such as Christopher Columbus and Vasco da Gama reach new lands and establish trade routes.