system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does glass shatter "uniformly", like all at once?
gpt
Actually, it doesn't. It shatters at the speed of sound in glass. It's just that this is about 4,000 meters per second. Meaning that even an almost thirteen foot long sheet of glass would shatter in a thousandth of a second.