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Let's hope this XM-25 rifle with its smart bullets doesn't find its way into enemy hands. The system is clever enough to detonate its exploding 25mm bullets within 3 feet of their targets, picking off unfortunate foes with uncanny accuracy, even when they're hiding behind obstacles.

After calculating the target's distance with a laser rangefinder, this lethal weapon sends a radio signal to a chip inside the bullet. That brilliant projectile can precisely measure the distance it's traveled, exploding at precisely the right distance for maximum killage. Ouch.

The U.S. military will begin field testing this crazy tech this year, with the goal of rolling it out on battlefields everywhere in a couple of years. Let's just hope U.S. troops won't need to be on battlefields then.