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Why we have fingernails & other awesome answers - Greg Foot Q&A (Ep 10) - Head Squeeze
Key Facts In This Video
Fingernails and hair are both made from a protein called keratin. 05:06
The oldest evidence of fingernails in human decedents date back to 55.8 million years ago. 05:27
Many other species exhibit fingernail-like attributes, demonstrating the trait's evolutionary lineage. 05:58