By Samantha Laine Perfas | Harvard Staff Writer | Harvard Gazette Did you know that most sneakers were designed around the male foot and those of women are different? Karen Korellis Reuther does. Reuther has worked in the design industry for more than 40 years. A former executive at the major apparel companies Reebok and Nike, she experienced firsthand the way the world has been designed and built largely by — and for — men. Her new book, “MAN-M…