The healing touch

Another one of those technologies someone will inevitably claim stemmed from reverse-engineering Roswell crash debris:

Crab chemical could give cars a self-healing 'shell'

Exposure to UV light creates reactive spots on sections of the chitosan molecules which then combine with the broken oxetane rings to form new chemical cross links that close up the damage. The process appears to begin at the bottom of a scratch, pulling it closed like a zipper.