It never gets dark anymore. Light pollution is not only making it more difficult to see the night sky, but it's also affecting human health. For the past century and a half, since the dawn of electric light, humans have been losing their connection to the night. In this episode, host Joe Hanson travels to McDonald Observatory in Texas, one of the darkest places in North America, to learn what people are doing in order to preserve dark skies. Part of the "It's Okay to Be Smart" series.