1) The average person walks the equivalent of three times around the world in a lifetime.

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

3) The discovery of the Americas by Christopher Columbus in 1492 opened up new trade routes and had a profound impact on world history.

4) The fall of the Berlin Wall in 1989 symbolized the end of the Cold War and the reunification of East and West Germany.