This roof-mounted air sensor in Addis Ababa, the capital of Ethiopia, is one of 10 used by NASA’s Multi-Angle Imager for Aerosols (MAIA) to study the city’s air quality. MAIA’s air sensors provide a detailed look at particulate matter that is 2.5 micrometers or less in diameter, also known as PM2.5, one of the world’s deadliest forms of
Comcast on Monday announced Xfinity Shield, a home-security platform that taps into Xfinity Wi-Fi in new ways. It adds WiFi Motion, which uses compatible Xfinity Wi-Fi routers to detect movement in the home without cameras or dedicated motion sensors. WiFi Motion and other Shield features are available at no additional cost to eligible Xfinity customers,
A laser beam tracks the motions of the tiny magnet suspended in a vacuum chamber as it wobbles in response to magnetic fields.Credit: Wei Ji, Peking University Scientists have turned a levitating magnet into a device for measuring magnetic fields, known as a magnetometer — one that is sensitive enough to detect the faint signals
