system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are monitors 144 hz instead of a flat 140 or 150?
gpt
It's divisible by 24, which is commonly used for cinema. 

If it was 140 hz you would have some weird possibility such as 20 frames showing for 7 cycles (which wouldn't sync with cinema), or stretching some frames for more refresh cycles to make 24 frames last 140 cycles (instead of showing each frame for 6 refresh cycles). 150 would have a similar issue.

144hz was the most sensible choice because each frame can be shown for 6 refresh cycles, and it can be split in half for 3 refresh cycles for each eye if used for 3D.