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Brazilian here - once had an english teacher call xadrez, the chess game, "checkers" (to be fair to her, "xadrez" could mean either the game or a checkered texture, but the game of checkers is what we call "damas"). She also called bolinhos (muffins) doughnuts (or "dou-go-nu-ty", as she spoke), and rosquinhas (doughnuts) muffins. I called out that she got the two mixed up, she ignored me.

She was a terrible teacher. She even forgot to put the correct text for an exam once, I asked her about the text during the exam and she just said "if you read it, you'll find (the answers)" - it took another kid bringing the same point for her to bother reading the exam she prepared and realizing she fucked up.

I had a teacher tell me women couldn't get hemophilia because it's a sex-linked gene. True enough, but it's on the X chromosome, and what do you suppose happens if a woman has that gene on both of them... I lost points on a test because of that.

This was before the internet, so I couldn't easily find answers to prove he was wrong.

This one is funny, I innocently listened to Motley Crue when I was about 12, Girls Girls Girls in particular. You know that lyric about the menage a trois? There was no Internet in those days, so I just thought I'd ask my French teacher. She covered a smile and told me it meant three people were living in a house together.

We watched an educational movie from the 1950s by Frank Capra, which my 8th grade science teacher had liked as a kid. He admitted they were somewhat dated, but still basically accurate.

In it, the scientist explained that they still don't understand how chloroplasts transform sunlight into energy. The cartoon chloroplast hid what she was doing and said something like, "The Russians don't know either."

I was pretty blown away by a scientist admitting they didn't know something, at that age, but when I looked it up, I discovered that scientists had pretty much figured it out, but it's very complicated.

Clip if you're interested: https://archive.org/details/our_mr_sun around 36:09

Or yt: https://youtu.be/VEfomqnif34?t=36m09s

“The human eye can only perceive 60 FPS”

This was in a graduate level class studying optics for virtual reality systems.

I shit you not. I believed this for far too long.

I'd surprisingly been thinking about this just a while ago. Definitely not the wrongest, but one of the weirdest things I have been taught was the theories of the origin of life. I remember being pretty confused by most of them (though the most accepted one made sense to me), but the one that said that life came from a meteorite from space was the one that tripped me up the most. AND WHERE DOES THE FREAKING LIFE THAT THE FREAKING METEORITE BROUGHT TO EARTH COME FROM?! It told me pretty much nothing.

I searched it up just to see if it really existed, and lo and behold, it is the seventh theory of the first result that I found which states exactly what I thought haha

I spent first 8 years in a Christian school, took me to adulthood to learn that evolution theory is not just a "unproven hypothesis"

that super size me was a reputible documentary

I had a Mormon science teacher who told us that there was a giant planet in the middle of the universe that astronomers could see and that was where god lived I never believed anything he said after that