That you brought into adulthood.
2 things I finally learnt the truth of:
I thought astronauts boots were really heavy to compensate for lower gravity untill I learned that's not how gravity works ie: if you drop a heavy ball and a light ball of the same siz they hit the ground at the same time.
I thought a "launch window" was a place in the atmosphere that was thinner and so safer to launch rockets through until I learned it is the time when the earth is in the right orbital position for the rocket to launch in the direction it wants to go.
Both into my 40s!
How about you?
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