I noticed this as a kid and my kid brain decided it had to be because my hands get more sunlight than my feet. Fingernails can photosynthesize right?
I noticed it as a kid too and figured it must be because I only pick my nose with my fingers. Boogers grow nails.
I only noticed in my 20s when I stopped biting my nails. I never realized how much I was biting and assumed the amount I bit off was equal to the amount I cut off my toe nails.
I thought it was because friction with socks wore down the toenails
steel wool socks keep the toenails in check
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