From the clamshell razors and homemade lye depilatories used in colonial America to the diode lasers and prescription pharmaceuticals available today, Americans have used a staggering array of tools to remove hair deemed unsightly, unnatural, or excessive. This is true especially for women and girls; conservative estimates indicate that 99% of American women have tried hair removal, and at least 85% regularly remove hair from their faces, armpits, legs, and bikini lines. How and when does hair become a problem--what makes some growth -excessive-? Who or what separates the necessary from the...