Did you ever park your car at home or outside ? And after afew hours come back find kana HIT & RUN ? Now there is something called "shape-memory alloys"
Here are a few sites abt it Enjoy :)
http://motorage.search-autoparts.com/motor...l.jsp?id=440708
http://www.esquire.com/features/road-trip-...hiftingcars0607
http://technology.newscientist.com/article...line-news_rss20