Yesterday at 1:51 p.m. Eastern Time, a 5.8-magnitude earthquake struck near a small town outside Washington, D.C., the strongest such tremor in 67 years. The geological event, which affected the eastern third of the United States, sent thousands of workers in our nation’s capital (and in New York City) scurrying into the streets waiting for news of what to do next. Fortunately, the quake resulted in only some minor injuries and minor damage to buildings, a shortened workday, and gridlock on the streets of Washington, but it is a reminder of America’s vulnerability to natural disaster—and that the United States must be prepared to ensure its homeland security.