Fuel cells could cut jets' energy consumption, emissions.
Electronic medical records help track and treat the homeless.
Visual fake-out should foil the 'spambots' used by junk-mail purveyors.
RNA-based method thwarts blood vessels.
T-rays could be more versatile than x-rays.
Tiny networked sensors that communicate through wireless links are being readied for market.
Software tricks borrowed from the world of particle physics are helping law enforcement agencies sift through mountains of information.
Proteins seen as a versatile platform for making tiny wires.
Geron CEO Thomas B. Okarma on creating stem cell therapies.
Anti-spam schemes that force people to prove they aren't machines won't work.