A group of scientists in Spain have developed what is said to be the world’s first self-healing polymer, which can spontaneously and independently repair itself without any intervention.

http://www.youtube.com/watch?v=6tVJL7RDOA8

Article

http://www.dailymail.co.uk/sciencetech/article-2421049/Terminator-Scientists-develop-worlds-self-healing-polymer-rival-T-1000-liquid-metal-robot.html