Summertime is vacation time but many U.S. workers can’t or won’t take time off. Some reasons for this include stingy employers, workers’ concern about being viewed as a slacker and the lack of laws that mandate paid time off. According to a 2012 survey by Kelton Research and commissioned by the Radisson Hotel chain, nearly 50 percent of American workers didn’t use half their vacation time the previous year. We’ll talk with the head of an advocacy group called Take Back Our Time, about the vacation problem in this country. Photo: Flickr/anda (: