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It is thought that the opposable thumb and the ability to make tools and weapons is what gave rise to the larger brains of humans. That and walking upright so our hands were free to use the weapons when hunting.
One of our customers at a former job had his thumb smashed and basically cut off in a car wreck. They took his big toe and transplanted it to his hand. He had a weird looking thumb, but it worked just fine.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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