Einstein once described his friend Michele Besso as “the best sounding board in Europe” for scientific ideas. They attended university together in Zurich; later they were colleagues at the patent ...

Why did Albert Einstein reject the existence of time? originally appeared on Quora: the knowledge sharing network where compelling questions are answered by people with unique insights. Answer by Paul ...

What does it mean to be to space-time? The seemingly simple question gets to the essence of twentieth-century physics and has driven a hundred-year debate between philosophy and science. In Einstein’s ...

The ancient Greeks conceived of five building blocks of matter – from bottom to top: earth, water, air, fire, and aether. Aether was the matter that filled the heavens and explained the rotation of ...