Gathering reconnaissance during battle typically puts small teams of soldiers in harm's way. Tiny robotic flyers, called micro air vehicles (MAVs), could do away with this danger. Learn all about spy flies.
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 »