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Data-mining techniques reveal fake Twitter accounts that give the impression of a vast political movement.
New communications schemes could make zombie PC networks far harder to shut down.
Anti-spam puzzles are helping researchers develop smarter algorithms.
The 2008 presidential election could be shaken by flawed electronic voting technology.
A prototype sensor consumes just a few nanowatts and could someday take pressure readings from the eye.
A new approach avoids flexible electronics.
Cooperating with file-sharing networks could avert congestion.
“Programmable friction” provides a new kind of feedback.
This animated cartoon is projected by a 635-nanometer scanning laser at eight kilohertz onto a flexible plastic screen. Screens that fluoresce blue, green, and yellow-red could eventually be combined to create a full-color display.