"Engineers and even the U.S. military have been seeking shape-shifting robots that can squeeze into tight spaces, such as cracks under doors in a disaster zone or between delicate parts of a human body on the operating table.
In
the latest development of soft robotics, researchers at MIT report
they've created — using materials that can be found at a craft store — a
new kind of robot muscle that goes soft when heated and hardens when cooled"
http://www.livescience.com/46805-new-muscle-for-squishy-robots.html