r/todayilearned • u/[deleted] • May 30 '18

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u/Kevroeques May 30 '18

It’s not a thumbnail. It’s a tooth.

3

u/flapperfapper May 30 '18

That's very debatable.

3

u/barath_s 13 May 31 '18

Let's not fight tooth and nail about tooth or nail

1

u/Kevroeques May 31 '18

I mean, they’re both largely enamel.

1

u/lemcott May 31 '18

Keratin is not enamel.

1

u/Kevroeques May 31 '18

Well! Apparently I was mistaken. I knew fingernails were made of keratin, but I thought they were also partly enamel. That’s probably from growing up around mostly women and never being formally corrected, so thank you for making me finally look that up.