The September Popular Science feature "Shock to the System" (on newsstands next week), discusses the hidden danger of brain trauma faced by soldiers exposed to bomb blasts. The article reveals that one in five American soldiers serving in Iraq may be suffering from a brain injury—not from direct contact with explosions, but from the effects of bomb blast waves that can cause life-threatening damage at the cellular level, even from distances previously considered safe.

Skin guns. Organ printers. Pig dust. Biochemist Alan Russell believes tools like these could one day be standard-issue for the battlefield medic. The skin gun would heal burns. The organ printer would replace badly wounded livers, kidneys, even hearts. And the pig dust?