Before it was a television show, Grey's Anatomy was a textbook. Published in 1858, Gray's Anatomy (spelled with an "a") quickly became the gold standard in medical illustration, featuring detailed diagrams of everything from the tiny bones in the hand to the internal structure of the eye. Gray's Anatomy is still in print today, in its 41st edition, but if you open the book up and flip through the pages you might notice something. Or really, the dearth of something: women. And it turns out it's not just Gray's Anatomy that has this problem—almost all medical textbooks are heavily biased...