1) Rihanna, born Robyn Rihanna Fenty, is a Barbadian singer, actress, and businesswoman. She has achieved great success in the music industry with hits like "Umbrella," "Diamonds," and "Work," and has also ventured into the worlds of fashion and cosmetics with her brands.

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

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

4) The most-watched TV series finale in the United States was "MAS*H," with an estimated 105 million viewers.