Prince Rupert’s Drops are quickly cooled teardrop shaped glass pieces that have amazing physical properties. While tough on the big end, they will explosively shatter if broken on the small end.
posted on Feb 17, 2008 - View this thread

Made from a nickel-titanium alloy, and highly processed for electrical activation and long life, the thin black thread-like BioMetal acts as an artificial muscle. When powered, the BioMetal contracts. When power turns off, the BioMetal quickly cools and the wire extends again to its longer, starting length.
posted on Nov 24, 2004 - View this thread