My hardest class in college was statistics, and mostly I learned that humans suck at them.

I was binging math videos recently and I got to one where one guy made a list of “random” heads or tails, and then the other guy guessed them and got like 60% right. He was disappointed because he often does better.

Humans, he asserted, will never write more than 3 (or was it 4?) heads in a row because they feel they aren’t random enough. And because if this, over half of the possible patterns are never seen.

Which is also why, when a test that’s failing 10% of the time, my coworker who thinks he just fixed it will run the new version five, ten times and claim victory... only for it to fail four times in a row the next day.