Time is weird stuff. When you can tell what altitude your atomic clock is by the offset in its notion of time with the clock at your side, you start to get an inkling about that. The professor who taught quantum mechanics at USC when I was there used to joke that God told Adam and Eve that it took 7 days to create the universe, but we know from our observations that it was closer to 14 billion years. Given these two…
Isn't that special relativity(time dilation) that your quantum mechanics teacher talking about there?
Apropos of nothing at the time I took it the title was 'Modern Physics' which basically was the senior physics class and covered a mix of things from some cosmology, relativity, quantum mechanics, and various papers that had come out the summer before.