system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do fans operate in the order: off>high>medium>low instead of off>low>medium>high?

It's incredibly trivial, but it really never made sense to me.
gpt
Some fans don't have enough power in the low setting to get themselves going from a standstill (AC motors can be weird). By putting High as the first setting, the fan is guaranteed to be spinning and have momentum before it gets switched to Low. 

You can try it out with a power strip to turn the fan on and off while the switch on the fan is set to Low. Some fans will start up fine, but some will just wiggle a bit without spinning.