Title: ELI5:If teeth, hair and nails are made of the same thing, why do teeth not grow back if broken? : explainlikeimfive
Headings: ELI5:If teeth, hair and nails are made of the same thing, why do teeth not grow back if broken?
ELI5:If teeth, hair and nails are made of the same thing, why do teeth not grow back if broken?
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Content: Why are solar panels only like ~20% efficient (i know there's higher and lower, but why are they so inefficient, why can't they be 90% efficient for example) ? I was looking into getting solar panels and a battery set up and its costs, and noticed that efficiency at 20% is considered high, what prevents them from being high efficiency, in the 80% or 90% range? EDIT: Thank you guys so much for your answers! This is incredibly interesting! 13.3k
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