In 2013, the average American worker took just 16 days worth of paid vacation -- about three weeks, over the course of a year. 

But more than half of those people say that even when they're lounging poolside they still keep working -- texting co-workers, checking email and filling last-minute requests.

Jack Dickey is a staff writer with TIME Magazine. In his cover article this week, he tries to solve the mystery of who killed vacation.