system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Howcome you can be somewhere with no wind blowing at all? Don't wind currents and all other factors ensure there should be air blowing everywhere at all times around Earth?
gpt
It's actually mathematically guaranteed. It's know as the hairy ball theorem. Basically if you have a round object (like the Earth) where, at every point there is some vector of something (a vector is anything that has strength and direction, which wind does), then there has to be at least one point where that vector is 0.

Translating this to Earth and the wind, that means there has to be some point on Earth where there is no wind. Now, it may be a different point from moment to moment, but if you were to take a snapshot of Earth, and know the direction and speed of all wind currents everywhere at every infinitesimal point, there would be at least one point where the wind would be 0.