Some researchers' clever creation: Has created a semi-conductive material that has been repeatedly cut and self-healed. Perhaps this leads to a cut-resistant robot, but it is more likely just for smart jeans. Big Capacity Plastic Packaging
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Engineers at the University of California, San Diego are studying improved self-healing materials that may take hours or days to repair severe damage, or require heat or some other catalyst to work. 
Researchers said: "We want to develop and easily discoverable, inexpensive materials with impressive self-repair capabilities in smart systems." A clever manufacturing process ensures that the printing ink acts as a permanent magnet piece and cuts, only they are divided into two smaller similarly oriented permanent magnets. As a result, when the two pieces are separated, one Arctic remains attracted to the other by the other South Pole. If not far apart, or close together, the two pieces of printed material combine, although they will not form a permanent connection, unlike some of the more exotic self-healing substances.
Even so, this can make harm to the circuit and sensor that can be immediately and easily cured, good news for flexible and wearable electronics, which is constantly reduced by the danger of bending.