For a long time, scientists have been searching for a single theory that connects all the forces of nature. A new geometric ...

Einstein had a birthday, of course. It was March 14, 1879. He was born in the small city of Ulm, Germany. What was his family like? Albert's dad, Hermann, worked with electrical equipment.

Many attempts were made during the 20th century, including by Hermann Weyl. Einstein's aim was to explain electromagnetism as a geometric property of four-dimensional spacetime. He continued this ...