nuclear war
Wednesday
Thursday
Russian President Vladimir Putin delivers his annual state of the nation address in Moscow on Thursday. Alexander Nemenov/AFP via Getty Images hide caption
Saturday
Russian missiles roll in Red Square in Moscow. President Vladimir Putin has warned that he wouldn't hesitate to use nuclear weapons to ward off Ukraine's attempt to reclaim control of its occupied regions. AP hide caption
Thursday
This is the mushroom cloud of the first atomic explosion at Trinity Test Site, N.M., on July 16, 1945. AP hide caption
Saturday
Fallout shelter signs, like this one, still hang on buildings around the U.S. Travis S./Flickr hide caption
As Rhetoric Ramps Up, Are Today's Kids Worried About Nuclear War?
Wednesday
The Cheyenne Mountain Complex was completed in the mid-1960s. The tunnels extend thousands of feet into Cheyenne Mountain in Colorado Springs, Colo. Courtesy Simon & Schuster hide caption