TechnologyWebcam knows how to snub shoulder surfers Software blanks the screen when the camera spots a second face peering in its direction, forcing nosy strangers to mind their own business 51¶¯Âþ
TechnologyPure samples of telltale gas could help nuke sniffers An exotic radioactive gas has been isolated for the first time, which should make it easier to detect underground nuclear bomb tests from air samples 51¶¯Âþ