1) Cows have best friends and can become stressed if they are separated.

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 word "bank" comes from the Italian word "banco," which means bench. In medieval Italy, bankers conducted their business on benches in the marketplace.

4) The Great Wall of China is not visible from space without aid, contrary to popular belief.