On some interesting news I read a few months ago, Pfizer’s (a major pharmaceutical company) patent on its impotence drug Viagra has been partially rejected after the U.S. Patent and Trademark Office (USPTO) said it wasn’t different enough from a Chinese herb called yin yang huo (more popularly known as Horny Goat Weed).

Yin Yang Huo (Horny Goat Weed)