I think relativity is the greatest scientific discovery. This greatest scientific idea of relativity is from geremy. Maybe in the 1905-1916 year Albert Einstein discovery this greatest scientific idea. Albert Einstein thought mass and energy were equivlent. For example A man and a women sitting for 1 house, it can seem like a 1 minutes. But let him sit on a hot store for 1 minute, and he'll feel like 1 house. This the theory of relativity, so need A manand women and store. because, I think einstcin made the theory of relativity of physics more thorough clear.