On Nov. 25, 1915, Albert Einstein published his Theory of General Relativity, forever changing the way physicists view our universe.
Most of us only recognize relativity from sci-fi movies and maybe a high-school physics class. We certainly can’t explain it from memory. So to celebrate the 100th anniversary of Einstein’s theory, the Albert Einstein YouTube channel made an animated video explaining relativity in a way that anyone can understand.
Photo via Rach/Wikimedia (CC BY 2.0)