U.S. Army Developing New Grenades that Bursts in the Air. No More Hiding, Bad Guys.

Soon, even walls or barricades won't protect soldiers at war from incoming fire. The U.S. Army is developing a new type of grenade that can automatically sense when it has cleared an obstacle before detonating.

Soldiers normally hide behind walls or other natural barriers, known as defilade obstacles. The program for the enhanced grenades began in 2012 in order to come up with solutions to more efficiently deal with targets hiding behind such concealment.