A two-millimeter-wide strip of an airy carbon-nanotube material expands to more than three times its width when a five-kilovolt voltage is applied to it.
Video by STEM-Science Technology Education Media - Read the Article
Hothead Technologies has developed a system that can sense and warn a user of heatstroke. In this video, an RFID transmitter is fitted in a headband and a white temperature-sensing patch touches the wearer's forehead. Readings are beamed to a PDA (not shown). When the wearer's temperature hits 102.5 and stays there for 20 seconds, an alarm sounds on the PDA.
Massachusetts Institute of Technology