Lice! It’s a word that sends terror into the hearts of parents everywhere. It makes you itch just to hear it. Lice have been plaguing us and our primate ancestors for 25 million years. In fact, one evolutionary theory attributes our hairless bodies as a biological strategy to avoid lice. It is estimated that between six and twelve million children ages 3 to 12 suffer from head lice in America in any given year, which makes this a robust (and recurring) market for companies looking to eliminate these pesky and — let’s admit it — revolting insects.