When you want to learn everything you can on all subjects related to the human hands, the number of topics to be studied is virtually endless. Take for example something called the "Right Hand Rule".
Even the definition of "right hand rule" takes a minute to understand.
Wikipedia: In mathematics and physics, the right-hand rule is a convention for determining relative directions of certain vectors.
Mathworld: The rule which determines the orientation of the cross product uxv. The right-hand rule states that the orientation of the vectors' cross product is determined by placing u and v tail-to-tail, flattening the right hand, extending it in the direction of u, and then curling the fingers in the direction that the angle v makes with u. The thumb then points in the direction of uxv.
And then it really gets technical: All You'll Ever Need to know about The Right Hand Rule