1) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active. It stands over 13,000 feet (4,000 meters) above sea level.

2) Elvis Presley, often referred to as the "King of Rock and Roll," has sold over one billion records worldwide.

3) The smallest unit of time is known as a zeptosecond, which is equal to one trillionth of one billionth of a second.

4) The signing of the Magna Carta in 1215 laid the foundation for modern democratic principles and limited the powers of the monarchy in England.