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When you cut yourself, it's amazing to watch how quickly your body acts to mend the wound. Immediately, your body works to pull the skin around the cut back together. If you have a scar, you can see the evidence of our bodies' self-healing power. Scientists are now developing a new type of composite material that will give those same self-healing qualities to spacecraft.

See more here
http://www.howstuffworks.com/self-healing-spacecraft.htm/printable