I think an Encarta 95 video about a laser shooting back and forth between two mirrors on a spaceship is still my mental model for how to think about time dilati

I think an Encarta 95 video about a laser shooting back and forth between two mirrors on a spaceship is still my mental model for how to think about time dilation. Wikipedia's wonderful, but the quality of the best multimedia content in Encarta was sky high in a way that's hard to reproduce without a team of paid artists and educators.