Since the 9/11 terrorist attacks, an estimated 54 other attacks on the U.S. have failed. And these are only the ones we know about. Some, like the underwear bomber and the shoe bomber, live on in infamy. Others are more obscure.
Whether you call it a homemade bomb, a booby trap or an improvised explosive device, an IED is simple to make, easily hidden and extraordinarily destructive. Why are these deadly devices one of the No. 1 killers of soldiers in Iraq.
In the last few years, the threat to commercial airplanes has become larger than ever. Learn how the Guardian Solution for Commercial Airplanes, created by Northrop Grumman, can defend the planes from lethal types of attacks.
In the first reports released since North Korea announced its underground nuclear test on Monday, officials are saying they have found no evidence of a nuclear signature in the air above the blast site.