The U.S. military wants to create a real-life "Iron Man" suit.
The Army's Special Operations Command is asking scientists to help.
Experts at the Massachusetts Institute of Technology are working on perfecting "liquid body armor" that turns solid instantly if hit by a bullet or shrapnel.
Sensors in the armor would also monitor a soldier's heart rate and temperature.
If all goes well, troops could be wearing the body armor in three years.