A phone application highlights hot spots and will soon show where different urban "tribes" gather.
Denial-of-service attacks are on the rise, research shows.
NASA researchers are using smart materials to improve helicopter performance.
By mimicking nonverbal actions, robots could become better assistants.
Browsers are changing to accommodate powerful applications.
Carbon nanotubes that respond to visible light might mean better solar cells and artificial retinas.
Presto loads a Web browser and other software in seconds.
Micrometers-wide tubes that grow spontaneously could be used to make tiny chemical devices.
Understanding how nanotubes heat up could make them useful for electronics.
A new protocol aims to protect privacy while allowing organizations to share valuable information.