• MasterFlamingo@lemm.ee
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    4 hours ago

    It was false then but my seventh and eighth grade science teacher told us that blood was blue. My mom was a nurse so I knew that it was bullshit but was definitely confused because he was my science teacher.

  • Nikls94@lemmy.world
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    4 hours ago

    That fluoride and vaccines are bad for you… tbh, I only believed it for 2-3 weeks until I did my own research, but it was a frightening clarification. Didn’t believe that teacher a single word after that.

    • turnip@sh.itjust.works
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      4 hours ago

      I think people underestimate the problems with teeth hygiene. It can cause dimensia, so teeth should be brushed before you eat, though avoid mouth wash.

      • Nikls94@lemmy.world
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        3 hours ago

        And don’t forget to floss! As soon as I learned that my gums don‘t bleed because of the metal thing, but because food between my teeth decays and that decaying decays my gums, turning it all into poop, I started to floss every second day.

        Why should I avoid mouth wash though? My routine is floss - mouth wash - brushing

        • turnip@sh.itjust.works
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          3 hours ago

          Just the cancer causing it does. I’d read a study on it one time, I believe it’s accurate.

  • invertedspear@lemm.ee
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    3 hours ago

    The moon was spun out of the same stuff as the earth. That was fact in the early years of my education. A few years later there were multiple theories: co development, captured a wandering planetoid, the Thea impact, and a fourth one I can’t remember but I think it was something dumb like planetary mitosis. By the time I graduated the Thea impact was considered the only viable theory.

  • ilinamorato@lemmy.world
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    7 hours ago

    I have one that was proven false, and then later re-proven true: the existence of the brontosaurus.

    When I was in elementary school, we were taught that they existed, they were big, etc. Then, at some point while I was in college, I discovered that actually what we thought was a brontosaur was a brachiosaur or an apatosaur. And then, when my kids went to school and learned about the brontosaur, I discovered that actually, they did exist!

  • Horsey@lemmy.world
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    5 hours ago

    By the time I was in school the Bohr model was already proven inaccurate, but was taught anyway because the orbital model is too esoteric for teenagers 🙄.

  • Captain Aggravated@sh.itjust.works
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    13 hours ago

    I was taught that Jupiter had 17 moons, Saturn has 12 and Pluto has 1. Many more have been discovered since.

    Then there’s the whole “different areas on your tongue taste different flavors.” Like you only taste sweet with the tip of your tongue, the middle tastes salty, etc. I remember being given various substances by my fifth grade teacher like sugar, coffee, lemon juice, table salt etc. and we tried putting them on different areas of our tongues and we were like “…no, we taste everything everywhere.”

    • cheesymoonshadow@lemmings.world
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      5 hours ago

      Were you guys eating coffee grounds in your 5th grade science class? Your next teacher either hated it because you guys were bouncing off the walls or loved it because you were all wide awake and paying attention.

    • turnip@sh.itjust.works
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      3 hours ago

      Did we conclude that, I thought its still heavily debated.

      Some argue in the 50s and 60s the US was spending Europe’s gold to build highways and infrastructure, gifting Americans the wealth with a continuation of the new deal, they then defaulted in 1971 as inflation eroded foreign debt owed.

      Some feel some form of debt accrual is how we derive such a consumption focused standard of living, which is misallocated capital that ends in someone holding the bag when it can’t realistically be paid back or when population doesn’t grow fast enough like in Japan or most of the developed countries.

  • Luke@lemmy.ml
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    20 hours ago

    Basically everything I can recall being told in D.A.R.E program classes (war on drugs era propaganda taught in public schools in the USA) was utter nonsense and fabricated bullshit. After actually having personal experience with most of the substances they vilified, none of the effects - good or ill - are what I was taught in that ridiculous program.

    On the contrary, some of the fear tactics they used made me curious to investigate on my own. The breathlessly scared rural teacher describing the mind bending effects that “magic mushrooms” was supposed to have sounded fascinating to teenage me. In reality, they are very fun and therapeutic to use, but nothing like the wild Alice in Wonderland mind journey they made it sound like it would be.