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

2) The Dow Jones Industrial Average (DJIA) is a stock market index that tracks the performance of 30 large, publicly owned companies in the United States.

3) The destructive power of cyclones is often attributed to their storm surge, which is a rise in sea level caused by the strong winds and low atmospheric pressure.

4) The world's largest particle accelerator, the Large Hadron Collider, is located near Geneva, Switzerland, and spans a circumference of 17 miles (27 kilometers).