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You can teach 1st aid similar to the ways that hospitals do. I also use this on campouts to see which scouts take charge of emergency situations and which scouts freeze.
Very realistic-looking wounds and burns can be created from clown / theatrical makeup (face-white, black, red, and blue); talcum powder; Knox gelatin (to simulate skin); chicken bones (to simulate broken bones); broken thin Plexiglas sheets (to simulate broken glass); charcoal/graphite (added for 3rd-degree burns); cocoa powder, corn starch, and food coloring (to simulate blood).