Thumb Rule
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How does one get such tiny nails?
Genetic lottery is how I got mine
Years of nail biting
Edit: I mean also the genes for a different thumb shape that inherently has a shorter nail in the first place; but besides that, the nails that are even shorter than the others in this pic would be due to habitual nail biting
Oh, that's weird. Their thimbs also look a bit shorter than usual...
https://en.m.wikipedia.org/wiki/Brachydactyly_type_D
My right pinkie-toe is like that, I think I stubbed my toe as a child or something