There is some serious technology and ingenuity involved in making a 172-foot-wide, bomb-carrying aircraft "disappear." Find out how the B-2 bomber deals with enemy radar.
In parts of cities like Washington, D.C., gunshot-detection systems are improving police response time to shots fired. Sometimes, the perpetrator hasn’t even had time to flee the scene when the cops arrive. See more »
On a television drama last week, the plot involved photos taken of a Russian missile silo, and the characters mentioned a "keyhole satellite." What is a keyhole satellite and what can it really spy on? See more »