When I got out of college, I spent a few months in Houston working as an exterminator. I learned all about insects and rodents, as well as how to kill them. One that caught my attention was the pharaoh ant, which is quite common worldwide. These are the really tiny ants that are nearly blind, but have a strong sense of smell. They follow chemical trails and look for simple sugars for food. If you spray them with regular poison, they recognize the danger and split their colony into smaller parts, spreading to new parts of the house and making the problem worse. For these critters, we used a bai...