The original question was: I have a question about the twin paradox. Physicist: The very short answer is: geometry works different in spacetime than it does in just space. The twin paradox is a result from special relativity that states that if one person, Alice, remains “stationary” and another person, Bob, takes any kind of round trip, then the stationary Alice will experience more time. The twin paradox isn’t a paradox at all, it’s just strange and off-putting (like twins). So is acceleration the secret to the twin paradox?