1) The Boston Celtics and the Los Angeles Lakers are the most successful teams in NBA history, with a combined total of 33 championships.

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

3) The ocean covers about 71% of the Earth's surface and contains roughly 97% of the planet's water.

4) The national animal of Canada is the beaver.