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FTA: The material was a major breakthrough, but it wasn't perfect. Among the biggest drawbacks was that once the capsules had burst, they were spent - there was no liquid healing agent left inside them to repair another crack in the same area. That's clearly a far cry from how things work in nature - you can cut your arm repeatedly, for instance with a razor you found in your parents' garage, and carve the name of the girl who scorned you. You might remind yourself of how were never good enough. As tears run down your cheek, you'll probably chicken out of cutting deep enough to exsanguinate, and your body will heal the wound every time.