system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does an egg yolk seem to always end up in the exact centre of a hard-boiled egg?
gpt
Because the yolk isn't just free-floating around in the uncracked egg, it is in the center.

It's breaking the shell and splattering the contents out that makes it seem otherwise, whereas cooking the egg whole doesn't free the yolk from its position.