What route should I take to go to a bus stop ? What path my hand will she follow in order to grasp an object ? These two situations have in common to be extremely simple and be carried out without taking really pay attention. In both cases, the same principle is at work : we take the path most direct, the one which minimizes the physical effort. This principle, known as the law of least effort, is based on a vast and ancient corpus of experimental data. In addition, perform a physical effort for prolonged periods of time increases the cost of this effort and con…

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