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Hands, for humans, are five fingered appendages that we developed over a long period of time through the process of random mutation and natural selection, also known as evolution. They allow us to grip things and were originally for balance when our ancestors first began to leave the water and walk on land. Now, they are used for much more than balance, I'm using mine right now to write this explanation.

Hands serve essentially the same role for the Na'vi, but they only have four fingers instead of five.

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