There’s a reference book called the Oxford Dictionary of Proverbs, which is how I know that it was some five-and-a-half centuries ago that a book first declared, “What you don’t know can’t hurt you.” ...
EDITOR’S NOTE: Chief Medical Correspondent Dr. Sanjay Gupta’s new book, “It Doesn’t Have to Hurt,” is available now. Watch “Dr. Sanjay Gupta Reports: It Doesn’t Have to Hurt.” at 9 p.m. ET on ...