1) The United Nations (UN) is an international organization founded in 1945 with the goal of promoting peace, security, and cooperation among nations through diplomatic and political means.

2) The term "bull market" refers to a period of rising stock prices, while a "bear market" refers to a period of falling stock prices.

3) The English alphabet has five vowels: A, E, I, O, and U.

4) The universe is estimated to be around 13.8 billion years old.