According to a chemistry professor in Paris, this Smart Rubber "can be stuck back together if it is torn, then used over and over." Video after the break.
Leibler and his colleagues built up their rubber from simple starting materials including vegetable oil and urea, a component of urine. The resulting material is a cross between silly putty and a rubber ball with applications ranging from adhesives to bicycle tires[via Spluch - NewScientist]
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