# Watch as Albert Einstein explains his famous formula, E=mc²

The most famous equation in all of science is Einstein’s E = mc2. The equation is derived by the twentieth-century physicist Albert Einstein, in which E represents units of energy, m represents units of mass, and c2 is the speed of light squared, or multiplied by itself.

Einstein was a German-born theoretical physicist who developed the theory of relativity, one of the two pillars of modern physics. His work is also known for its influence on the philosophy of science. He was born at Ulm, in Württemberg, Germany, on March 14, 1879.

He became a German citizen in 1914 and remained in Berlin until 1933 when he renounced his citizenship for political reasons and emigrated to America to take the position of Professor of Theoretical Physics at Princeton. In 1921, he won the Nobel Prize in Physics. He later became a United States citizen in 1940 and retired from his post in 1945.

Below is a video of Einstein explaining his famous formula, E=mc². It is really incredible to hear his voice. Enjoy!

**Below is the transcript of the video.**

“It followed from the special theory of relativity that mass and energy are both but different manifestations of the same thing — a somewhat unfamiliar conception for the average mind. Furthermore, the equation E is equal to m c-squared, in which energy is put equal to mass, multiplied by the square of the velocity of light, showed that very small amounts of mass may be converted into a very large amount of energy and vice versa. The mass and energy were in fact equivalent, according to the formula mentioned before. This was demonstrated by Cockcroft and Walton in 1932, experimentally.”