How Tiny Would Donald Trump’s Hands Be If They Were Black Holes?

Let me tell you a little something about gravity: It’s weird. A hundred or so years ago, Albert Einstein realised Isaac Newton’s laws didn’t work so well for really extreme situations, ones Newton never would have encountered on 17th century Earth. So Einstein said, alright, let’s come up with a new theory that looks like Newton’s theory, but also works for really big things and really fast things like planets and light—called general relativity. Einstein’s theory says mass causes the shape of space and time to change. Read More >>