What is common knowledge in your field but shocks outsiders?

Aircraft fuel is stored in the wings!
Reposted from Kari Dru
What is common knowledge in your field but shocks outsiders?

We don't all have the same number of bones or muscles. There's an average, I guess. We all kind of cluster around it. Some muscles are pretty rare. Some people just invent their own artisanal bones.

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