Since human beings began walking we have relied heavily on the health of our feet. The earliest record of anyone using shoes was discovered in what is now Missouri Native Americans appear to have worn foot coverings 8,000 years ago. As soon as people started to cover their feet, they began to experience friction from those coverings. Blisters soon followed. Since then, men and women have tried to limit the effects of friction on the foot. All sorts of applications have been tried. It took
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