Free will seems so obvious. Whatever I want to do, I just do. But could 'I' be fooled? Some say that free will is an illusion, and they back up their claim with scientific experiments. Others say that free will is a mystery. Still others alter the definition of free will to be 'compatible' with a deterministic world.

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Michael M. Merzenich is a Professor Emeritus Neuroscientist at the University of California, San Francisco.

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