A mind-bending new theory has reignited one of humanity's oldest questions: are we really in control of our own lives?

Most of us just accept that relationships lose spark over time. Intensity fades, the butterflies settle, and eventually you slide into something steady, comfortable, and routine. Meet parallel life ...

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 ...

Forbes contributors publish independent expert analyses and insights. I write about relationships, personality, and everyday psychology. When people are plagued with regret, especially in the face of ...