What were you surprised to learn wasn't actually normal?
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That not everyone cracked their head open as a kid. I just assumed everyone has had stitches in their forehead until I was in my twenties, everyone I knew had some sort of scar like that.
To be fair a lot of us had to get the ol' melon repaired to one degree or another
That's why nature saw fit to use the strongest shape to protect the most important organ