When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That's relativity.
Albert Einstein was a German-born theoretical physicist who is best known for developing the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics). His equation E=mc² is one of the most famous formulas in the world. Einstein's scientific genius and groundbreaking contributions revolutionized our understanding of the universe.