Learn more about the chemistry of cats: On catnip, pheromones and kitty litter

They are seemingly the most popular thing on the Internet, the subject of millions of videos and hundreds of memes: cats. This week Reactions answers some of the biggest kitty questions out there: Why does catnip make most cats go crazy? What does it mean when your cat rubs against your leg? How does kitty litter clump? Check out the nearly purr-fect video to gain insight into these common kitty questions.

Image Credit: puamelia, via Flickr [CC BY-SA 2.0]