"Designed to wound or kill, bullets come in all shapes and sizes. Over generations, bullets have altered the face of history, changed the way we wage war, and shaped our world. The science of ballistics has transformed the humble musket ball into the ruthless 50-caliber rifle bullet, so powerful it can punch through an armored car. It may sound like science fiction, but researchers are getting close to making a bullet that will lock onto its target and never miss."

http://www.youtube.com/watch?v=miZJJKiQarY...D50&index=4