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Albert Einstein conducted thought experiments to figure out theoretical problems. Let’s do one of our own. Suppose that you fell and broke your left leg and had to be in a cast for eight weeks. Would you expect your left leg to be as strong as your right leg when the cast was removed? Of course not. You know that muscle that is not exercised gets smaller and softer. Secondly, would you expect that, by sitting in a recliner for the next two months, your left calf would magically grow back and strengthen to where it was before? Of course, you w...
