this post was submitted on 26 Jun 2026
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[–] teyrnon@sh.itjust.works 84 points 3 weeks ago (5 children)

We were taught blood was blue in school, not just once, in at least two grades. Not in the book mind you, but from the teachers' mouths.

The 7th grade science book did teach us gamma rays move faster than the speed of light, which is bullshit.

[–] OfCourseNot@fedia.io 53 points 3 weeks ago (2 children)

Gamma rays do travel faster than light through some media, but obviously not faster than c, the speed of light in a vacuum.

[–] SpaceNoodle@lemmy.world 25 points 3 weeks ago (2 children)

Well yeah, the media was that one kid's 7th grade science book

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[–] Orygin@sh.itjust.works 8 points 3 weeks ago (9 children)

Gamma rays are photons like light no? Is the speed in a medium related to its energy/frequency? Or am I misunderstanding something

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[–] HeyThisIsntTheYMCA@lemmy.world 17 points 3 weeks ago (5 children)

The worst misinformation we got was that after erections (which functionally are made via blood flow) boys pee out the blood. Like Jesus fuck lady, what is wrong with your husband.

[–] samus12345@lemmy.world 9 points 3 weeks ago

That's an odd one, since you'd think peeing or not peeing blood would be very easy to verify.

[–] M137@lemmy.today 6 points 3 weeks ago (1 children)

That's definitely not about her husband, it's about scare tactics. The reason behind using scare tactics can be many, like religion, suppressed sexuality, what she was taught or even just not wanting to deal with her students doing stuff. It's absolutely not ok to say that no matter the reason though.

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[–] ProdigiousInsanity@lemmus.org 15 points 3 weeks ago (1 children)

Came here to say the same thing, for years I was believing my blood was blue before it hit oxygen....

[–] albbi@piefed.ca 8 points 3 weeks ago (2 children)

I was going to add the "hitting oxygen" is an important part of the blue blood myth back then.

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[–] lyralycan@sh.itjust.works 7 points 3 weeks ago* (last edited 3 weeks ago) (4 children)

Holy shit.

As someone who does not possess the knowledge, is blood white? The deoxygenated channels?

[–] MoonMelon@lemmy.ml 21 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

Deoxygenated, venous blood is dark red. Oxygenated, arterial blood is bright red.

I was taught the "blood is blue" myth also. My mom was livid, since her job involved drawing lots of blood, starting IVs etc.

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[–] village604@adultswim.fan 17 points 3 weeks ago (2 children)
[–] anomnom@sh.itjust.works 8 points 3 weeks ago

Plasma separated from red blood cells is sorta yellowish beige. At least in IV bags.

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[–] Murse@slrpnk.net 37 points 3 weeks ago (2 children)

We're still there, aunt Marge is just called Grok now.

[–] HeyThisIsntTheYMCA@lemmy.world 9 points 3 weeks ago

I don't want to think that badly about aunt Marge. How about Gemini? Marge wasn't gropey

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[–] ParlimentOfDoom@piefed.zip 30 points 3 weeks ago (1 children)

Now an LLM has parsed Aunt Marge's Facebook posts into it's knowledge bank and regurgitates it to everyone searching online for an answer.

[–] prole@lemmy.blahaj.zone 6 points 3 weeks ago (2 children)

I'd prefer it if they actually worked that way

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[–] Alexstarfire@lemmy.world 28 points 3 weeks ago (1 children)

Nothing has really changed since then.

[–] BeUnique@lemmy.zip 33 points 3 weeks ago

Just where you get your misinformation.

[–] Whats_your_reasoning@lemmy.world 28 points 3 weeks ago (2 children)

I had an argument with a teacher in middle school who shared the crap of, “If you swallow gum, it stays in your stomach for 7 years.” The kids told me I must be wrong, because the teacher said it so he must be right.

I was so pissed that I came in the next day with three different sources saying that it was a myth. He quietly admitted the truth to me, but refused to tell the class.

I get being frustrated with kids chewing gum in class, but if you have to lie to get them to follow rules, that’s a failure as a teacher. He was a science teacher, no less. If anybody should be open to a student pulling up sources for a claim, or to admitting they learned something new and they were wrong before, it should be a science teacher.

Thanks, Mr H. Way to prove to me that even “cool” teachers care more about controlling kids than being truthful.

[–] Dasus@lemmy.world 10 points 3 weeks ago (1 children)

He quietly admitted the truth to me, but refused to tell the class.

98% of humanity, right there. Fuck I hate them.

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[–] historicaldocuments@lemmy.world 9 points 3 weeks ago

To make kids look stupid in front of their peers by taking an authority figure at their word you just have to be willing to burn credibility.

[–] SaharaMaleikuhm@feddit.org 27 points 3 weeks ago (3 children)

That's right thanks to the internet misinformation is no more!

[–] nullspace@lemmy.world 6 points 3 weeks ago

Right about more things. Also confidently wrong about just as many things.

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[–] DupaCycki@lemmy.world 25 points 3 weeks ago (1 children)

Now you ask uncle Grok and carry his misinformation for 20 minutes, because your long-term memory doesn't exist anymore.

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[–] treadful@lemmy.zip 24 points 3 weeks ago (1 children)

Or, if you were lucky, you could look things up in your out of date encyclopedias.

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[–] Malyca@lemmy.zip 23 points 3 weeks ago (7 children)

My dad told me thunder is when clouds collide

[–] forkDestroyer@infosec.pub 6 points 3 weeks ago

Hoho man, I'm gonna use that one

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[–] Fedizen@lemmy.world 17 points 3 weeks ago (1 children)

"Urine is sterile"

"You can only fold paper 7 times"

Etc.

[–] Evotech@lemmy.world 12 points 3 weeks ago (7 children)

The paper thing is is testable! It’s not wrong. «You» can’t do it

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[–] CompactFlax@discuss.tchncs.de 17 points 3 weeks ago (1 children)

And with AI and anti-science grifters, we’re back to that world!

[–] village604@adultswim.fan 16 points 3 weeks ago

We never really left

[–] Bonus@sh.itjust.works 14 points 3 weeks ago (2 children)

We were led to believe we'd die if we ate a single apple seed until about 1995, when I observed my FIL eat an entire apple, core, seeds, and all, which obviously blew my mind.

[–] Doomsider@lemmy.world 8 points 3 weeks ago (3 children)

They will kill you, but you need to chew up a couple hundred.

[–] Abyssian@lemmy.world 7 points 3 weeks ago

Thank God, a way out of this madness.

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[–] CarbonIceDragon@pawb.social 14 points 3 weeks ago (2 children)

Tbf, some blood is blue, it just tends to be a few types of invertebrates that have that blood.

[–] TubularTittyFrog@lemmy.world 14 points 3 weeks ago* (last edited 3 weeks ago)

next thing you'll be telling me that some animals can change their sex.

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[–] Prior_Industry@lemmy.world 13 points 3 weeks ago

Now someone’s aunt marge in another country does it.

[–] tired_n_bored@lemmy.world 12 points 3 weeks ago (1 children)

As if now people are knowledgeable...

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[–] Mucki@feddit.org 10 points 3 weeks ago (1 children)

"So nothing really changed, except you don't ask your aunt anything anymore. You still talking to her?"

[–] rumba@lemmy.zip 8 points 3 weeks ago
[–] Mulligrubs@lemmy.world 10 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

I was taught that the white race was superior and that there was going to be a huge race war (one side of the family) and then Jesus was going to come back and murder everybody (other side).

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[–] Lushed_Lungfish@lemmy.ca 10 points 3 weeks ago (1 children)

You could go to your local library. I still do.

[–] nek0d3r@midwest.social 6 points 3 weeks ago

You could, but that info was still there. Schools and educational material taught us that blood was blue, Columbus discovered America, and animals were hot or cold blooded.

[–] thespcicifcocean@lemmy.world 7 points 3 weeks ago

My ex thought that night time just meant that the moon went in front of the sun. I have no idea how she managed to live to 30 years old before she learned about night time.

[–] BigDiction@lemmy.world 6 points 3 weeks ago (1 children)

Cousin asked my uncle how cows stood straight on the hills. He said one set of legs were shorter than the other s and sincerely believed that until going off to college lol

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[–] some_guy@lemmy.sdf.org 6 points 3 weeks ago

My family bought an encyclopedia set. My older brother used it to teach me about tornados to help take my mind off my chicken pox when I was a kid.

[–] Dasus@lemmy.world 6 points 3 weeks ago (2 children)

I used the library. Because I didn't trust people or they didn't even attempt to answer. "I don't know, who cares."

Even if I wanted to use the internet, when it started becoming popular, it used to be in the library. You'd have to reserve 30min to an hour timeslots beforehand. And then physically go back to the library at that specified time and use their computer to browse. Going to AltaVista.

I used to Ask Jeeves.

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