Growing up, I knew a few things about dinosaurs. Like a lot of things I learned as a child, I accepted them and moved on, never bothering to question them.

Recently, I learned:

1. Birds are dinosaurs.
2. Spinosaurus is better than Tyrannosaurus.¹
3. Brontosaurus was once considered its own genus, then it was just an Apatosaurus, then it was different again.

It turns out there was a time² when it was declared the Brontosaurus didn’t exist. (Because it was the same as the Apatosaurus, the paleontologists said.) And then there was a big announcement that it actually did.

We’ve all learned things as children that we’ve carried into adulthood. Most are probably true and harmless, but a lot aren’t.

What “truths” about jiu-jitsu did you learn as a white belt and still believe, years into your training?