SpaceAdmiral writes "An Israeli company is working on a method to freeze-dry blood. This would enable soldiers to carry a packet of their own blood on the battlefield. If a soldier is injured and needs blood, medics could mix the dried blood with water and give the soldier a transfusion of his or her own blood. From the article: 'The idea is to take a soldier's blood, freeze it in laboratory conditions, take out the ice crystals leaving only the blood components. It will look like freeze-dried coffee in a little bag.'"