It's always interesting to see what bits of "common knowledge" change as the years go on. I once had a teacher say I was being silly for saying lightning could hit your water pipes while showering, and it turns out that's totally true. Here are just a few more things that we learned in school but turned out to be completely bogus.
Pluto is no longer considered a planet
It was pretty debatable from the get-go, but NASA officially confirmed it in 2009.
Both halves of an earthworm don't stay alive if you cut one in half
Turns out that's just the synapses in its body dying out. It's very much dead.
Dinosaurs had feathers
It probably didn't help that we were all obsessed with Jurassic Park, but dinosaurs, and especially Velociraptors, were more like walking primitive birds than giant lizards.
You don't have to wait 30 minutes after eating before going swimming
Our parents thought our bodies would legitimately seize up and we'd drown. Turns out you just have to try not to throw up.
The lies just get bigger from here...
The tongue map of taste buds is total BS
We have different kinds of taste buds throughout our entire tongue, not in sectioned off parts. This has been known for decades, but for some reason we still teach it to kids.
We definitely now all have calculators with us
Not to mention access to enough information to make the Library of Alexandria blush.
Y2K ultimately ended up not being a big deal
Efforts to fix the bug had already been going on for at least two years by the time the media caught wind of it and everyone started freaking out.
De-oxygenated blood is not blue
Seriously, your blood is red. It has always been red, it will always be red.
The food pyramid is pretty much completely wrong
Eating the amount of carbs that it recommends has been confirmed by multiple sources to be pretty damn bad for you.
We have literally never needed to write in cursive outside of signatures
Remember your fourth grade teacher yelling at you over how important it was? Thanks for nothing, Ms. Windsor.