Albert Einstein's discoveries changed our concept of gravity by adding revolutionary layers to Isaac Newton's theories. Here's what else Einstein did.

Albert Einstein's discoveries changed our concept of gravity by adding revolutionary layers to Isaac Newton's theories. Here's what else Einstein did.

Albert Einstein is seen during a visit to Washington, D.C., in the 1920s. ... Again, Einstein didn’t invent solar cells; the first crude versions of them date back to 1839.

On 2 August 1939, Albert Einstein wrote a letter that would result in the Manhattan Project, and one of history's most significant, and destructive, inventions – the atomic bomb.