Nature speaks to theoretical physicists to explore the real theories that inspired the hit series. Warning: contains spoilers ...

Forbes contributors publish independent expert analyses and insights. Mark Travers writes about the world of psychology. When people are plagued with regret, especially in the face of uncertainty or ...

Have you ever thought: "What if I had accepted this job abroad?", "What if I had stayed with this person?", "What if I had followed this other path?"... Welcome to the fascinating – and sometimes ...