Why are the palms of our hands so much lighter than the rest of our hand?
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The easy answer is because we have less melanin in our palms (and soles), but you’re probably asking for an evolutionary explaination.
We aren’t sure.
One theory is about communication, humans naturally gesticulate and it’s a large part of communication, which was even larger before the invention of language. White palms would stand out and make it easier to read body language at distance or in dim light. You may notice that showing palms is usually a friendly/submissive gesture.
I lkie that one, but that doesn’t mean it’s correct.
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