Dear PF Forum, I'd like to have some opinions here. A friend of mine says, "From Newton , we got car, airplane, rocket, etc. From Einstein, we got sci fi movies". Okayy, forget him Now, what I want to know is, what relativity has direct impact in our everyday life? There are two things that I know 1. GPS. Is GPS really depend on relativity? I heard that the clock synchronization is not trivia. 2. Nuclear energy. Are there anything else? Air conditioner? Television? Electric shaver? Just any everyday devices, not just "Oh, you see that rocket. Its clock is slowing down by half of our clock, so it rocket must have travelled at 0.866c" Not that I like Isaac more then Albert. I know that Einstein got noble price not by relativity but by photoelectric. I'm not asking what photoelectric has to do with our everyday life, but what relativity especially has got to do with our everyday life? (And by that I don't mean Special Relativity ).