In a seminal study, Reed and his team used modern lice DNA to trace the origin of clothing use back to around 170,000 years ago. According to Reed, this was a game-changing moment for our ancestors.

The term "nits" actually describes the eggs of head lice. They're often the first sign of an infestation. And with one louse laying more than 100 in their month-long lifespan, there can be a lot of ...

secondary outcomes were absence of live head lice on days 2 and 8 and—for patients in the extension stage—on days 22 and 29. Overall, 376 households with 812 patients were enrolled.