 in time, millions of years ago, in primate behavior. Here's an interesting study from a new scientist. Sick chimpanzees seek out range of plants with medicinal properties. Those of you who are pet owners, you know, sometimes you'll see, like, your dog has an upset stomach or something, and they'll go and they'll eat some grass, and then they'll barf it up. It's almost like they know what to do to get some chlorophyll in their system to detox them.