视频说明
Ever wondered why we have fingernails? ? In just 60 Seconds of Wow, discover the weird but cool truth about what fingernails are made of, why they keep growing, and the surprising job they do for your fingertips!
60 Seconds of Wow is our series of fast, fun videos where we explain the science, facts and knowledge behind everyday (and sometimes gross!) things. From mud to snot to earwax to fingernails, get ready for quick facts that make you go "WOW!"
Perfect for curious kids, classroom starters, and anyone who loves fun science facts.
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