body heat, it gradually reverts to screen shape and prevents blood clots from reaching the heart.
Shape-memory alloys may even help solve future energy shortages, says Schetky, a metallurgist at the In- ternational Copper Research Associa- tion. In tropical oceans and large res- ervoirs behind hydroelectric dams, alloy rods could be alternately low- ered to cold deep waters and raised to warmer surface waters. The resulting
Heated, this antenna metal contractions, he suggests, could regains its...