Warts (verrucae) are caused by a virus called the human papillomavirus (1). The numerous strains of papillomaviruses that cause the common wart are transferred by physical contact and enter the skin at... (read more)
Friction between the foot and the floor is important in walking and running. Friction allows us to stand in place without slipping and to push off during the normal gait cycle. Each step we take results... (read more)
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