We filtered out our traffic to hits originating from DHS.gov, and found that, yes, the Department of Homeland Security reads PopSci. (Hi!) They're not supplying huge traffic--barely over 50,000 hits in total--but it's definitely enough to monitor, and we can see pretty clear spikes and valleys coming from them. The biggest spike was on July 11th, 2011, though the DHS doesn't seem to have been looking for anything in particular that day. And there was a significant drop-off in terrorism monitoring right before Labor Day, which we attribute to ideal golf conditions. Anyway, here are five of their most read articles.