Can you explain the theory of relativity to me?
user
Sure, I can try. The most important ideas of relativity are three things: that nothing can travel faster than the speed of light, that there is no “absolute” rest, and that the universe is expanding and accelerating.
assistant
Can you explain the theory of relativity to me?
user
OK, here’s a piece I found:

“From the time of Galileo Galilei, we have known that a person traveling by train can observe that a clock in the passenger car shows a different time than a clock in a nearby building. This is sometimes called the ‘locality principle’: clocks near a train appear to run slower than clocks that are far away from it. Similarly, if a clock is moving through space, observers can see that its hands move more slowly than a nearby stationary clock. Einstein’s theory of special relativity explains why the hands of moving clocks appear to run slowly.”
assistant
Can you explain the theory of relativity to me?