Soldiers have long dreamed of smart bullets that always hit their targets, and it looks like they're now much closer to getting their wish. DARPA has posted the first footage of EXACTO (Extreme Accuracy Tasked Ordnance), a .50-caliber bullet that uses optical guidance and sensors to home in on its prey. As you see in the fuzzy-looking video below, the projectile compensates for movement, weather and wind with all the agility of a missile -- even if you try to miss, it easily swerves back on track. The project is still young, but it could prove a tremendous help to long-distance snipers for whom even the tiniest slip-up could ruin a shot.