Imagine the scene in Shakespeare's Romeo + Juliet without the line, "Do you bite your thumb at me, Sir?" It's hard, isn't it? Humans stand out from our distantly-related mammal cousins because of our thumbs. Our thumbs and our primate and ape relatives thumbs are opposable. However, our thumbs have the capabilities to do so much more than our animal counterparts. Human thumbs have the dexterity to fold and touch other fingers as well as stretch in different directions. Try it now: move your thumb and fingers simultaneously, and you'll see how different they are. Pretty neat, huh?
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