Einstein came up with an example to show the effects of time dilation that he called the "twin paradox." It's a lot like the Time Traveler game you just played. Let's try it out with a pair of ...

Is it possible for us to choose freely if we live in a world like this? Although based in physics, the Twin Paradox is a treasure trove of philosophy regarding time, existence, and identity.

What are the chances?! The twin paradox invites you to imagine a pair of identical twins who decide to take part in an experiment. They decide that twin A is going to remain on Earth, while twin B ...