Sensitivity of human fingers
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Okay, I’ll admit it. I’ve always been skeptical of @paul-sellers ability to accurately tell how large the set on his plane is by simply swiping his hand across it. I’ve got only a single #4 so I’m always adjusting it for the task at hand.
It turns out that human fingers really are that sensitive:
http://www.sciencedaily.com/releases/2013/09/130916110853.htm
It just goes to show what a lifetime of paying attention to all your senses can train your body to do!
Nate