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Why do smoke alarms keep going off even when there’s no smoke?
The Conversation via Yahoo News· 1 month agoSensors in smoke detectors monitor how particles in the air affect a flow of current to the battery...
10 everyday NASA inventions and spin-offs you can find in your home
Space via Yahoo News· 1 year agoa person dressed as an astronaut sits at a kitchen able surounded by NASA inventions and spin-offs...