eli5/Why are our fingers all slightly different lengths?
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It’s hard to prove, but I think there are two things at play. First: The index finger has to be a certain length to work well with the thumb. Second: When you do a pull-up your arms slightly rotate, so the ring finger and pinkie have to be shorter than the middle finger to line up. Most of the load will be on the middle finger and ring finger. If they were the same length only the pinkie would make contact.
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