For me it is the fact that our blood contains iron. I earlier used to believe the word stood for some ‘organic element’ since I couldn’t accept we had metal flowing through our supposed carbon-based bodies, till I realized that is where the taste and smell of blood comes from.

  • @sndrtj@feddit.nl
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    241 year ago

    Chitin is not produced by mammals.

    Fingernails are composed primarily out of keratin (same as hair and skin).