In 8th grade grade my family had to be in Mt.Ida, Arkansas for 9 months or so. During that time I had to attend the local public school and I remember the science teacher saying "matter cannot be created nor destroyed." I've always loved science and was a huge nerd during that awkward time in a kids life and I knew well it was ENERGY and figured she just said it by accident. Easy mistake. I said that it was energy, not matter, that can't be created nor destroyed and she argued with me and was dead serious when she insisted it was indeed matter.

I said something along the lines of hydrogen turning to helium inside the sun, and wouldn't ya know it, she didn't believe the universe was old enough for that to be true. Yup, she was a 5000 year creationist... teaching science in a public school in bumfuck Arkansas. I gave up and a lot of things she said bwfore finally started making sense but in all the wrong ways.

This bumb bitch was a fundamentalist Christian. The rest of the brief time I was there, and for the first time in my life, I didn't give two shits about a class that was usually one of my favorites. Thanks, Jesus.

"Medieval armies didn't use crossbows when attacking castles."

My hand immediately shot up. "What are you talking about? Of course they did."

My elderly history teacher replied "no, they didn't."

Me "Why do you think that?"

Her "because crossbows fire in a straight line so they would just shoot over the castle."

I looked at my classmates, hoping they would see how insane this is. They were looking at me like I grew a second head.

Me "that's not true. At all."

Her, getting slightly annoyed, "how do you know?"

Me "well for one, I've fired a crossbow, I know how they work. For two, they had GRAVITY BACK THEN, the bolt comes back down!"

Her, and some of the class "ooooh!"

...

Her "well anyway...." And continues the lesson.

This was a college class.

By the same civics teacher: All unions but teacher unions are obsolete. Welfare queens are having more kids just to collect more. Realestate only goes up. He also said that the Waltons(of Walmart) were second to fifth riches people in the world. I did fact check him with a Forbes printout on that one. I think there's more neo-con bs that I'm forgetting at the moment.

Computer teacher: Your muscles contain memory cells and that's now typists can type so fast. This was a very creative interpretation of "Muscle Memory".

Media teacher: AM radio travels in beams and can go farther then FM radio that travels in waves.

School therapist: If you get into that harder class, you may fail and feel sad. Guess what? Now having succeed at someone else's expectation, I feel sad all the time. That may have been the moment were I could have fixed the direction my life was taking if I pushed back. Chances are they would have come up with other reasons to deny me though.

Karl Marx was russian(by a history teacher)

Adults with autism dont exist, but kids with autism exist; the moon is an artificial satellite made by aliens; scientists are saying that 2+2=5 (by a logic teacher)

There is a conspiracy(organized by the jewish world leader) in romanian schools to trick children into starting HRT by saying to take some pills so they wont look pale right before going to act in front of an audience so they would become infertile and stop overpopulation(by a biology teacher)

That "th" sounds like the letter "f". It doesn't but I'm nearly 40 and still can't pronounce it correctly.

This one is a little different. On the first week of some college introductory economics class, the teacher was basically just reading from the textbook we all had, some historical figure who was a member of the "Council Of Seven" or something like that, when a student raised her hand - "Ma'am, what was the Council Of Seven?" - the teacher paused, and said - "Can you bring it tomorrow, as assignment?" - and actually giggled. This was in the 90s, pre-internet, looking up something like that was not a trivial task.

The teacher might have thought she was being cute and/or deflected her own shortcomings, but the actual effect was that we immediately lost all respect and trust for her, no one ever raised a hand again in her class, we all immediately went into rote robot mode for the rest of the semester, disengaged on a gut level.

When talking about movements of the Earth in geography, we covered the earths rotation, the orbit around the sun, the usual stuff. I mentioned precession as an additional movement - I had read about it in a book just recently. The teacher completely ruled that out and called me stupid for that. Jokes on him.

"Life sciences" teacher in middle school at a Christian school told us evolution was impossible because genetic mutations only cause a loss of information. Sneaky assholes

That "electricity" was a service

Without context, it is a good.

It's like natural gas. It is a good.

It's like saying "milk" is a service because the milk man brings it to your house

She wouldn't give me my damn point back on the quiz

She very matter-of-factly stated that steam wasn’t as hot as boiling water. This was a chemistry teacher.

Given, it was elementary school, so the “chemistry” was mostly super basic stuff like mixing dish soap and yeast with hydrogen peroxide. But still, I’m salty about that one because I had been burned pretty badly by active steam before she said that. I still have the scar and everything.

We'd all end up drugged with needles up our arms laying in front of the unemployment centers of we don't get better at chemistry. Like, all of us.

Joke's on him, I'm in IT now, so I'm of WAY worse.

That Wikipedia was unreliable

There is no such thing as negative numbers. "How do you take 5 apples from 3 when there are only 3 apples?" This was in elementary school in Wisconsin. The temperature regularly goes below zero. Pointing this out got me time in the corner. I'm still kinda salty about that.

Skateboarding is unethical, immoral, and should be illegal…

I wrote my next essay in highlighter after that to make her suffer. She was the worst

I used the word poesy in a written assignment, as in the art of poetry. The teacher didn't recognize it as a real word and deducted points from my grade. She had a policy that we could correct and resubmit for half points, so I did that but didn't change the word, I just helpfully gave her the definition in a footnote.

Shocked, naive, innocent little me didn't not know what to think when she took that as an insult. I was only trying to help her, didn't she get that?!?

This was one of a handful of events when my sister started implying I might have a neurospicy brain. IDK, maybe, but I was just being accurate so I didn't really see that as anything I needes to address. I thought the overly-sensitive and factually incorrect teacher was the one who needed to self-reflect.