Add Yahoo as a preferred source to see more of our stories on Google. The free AccuWeather app has more than a dozen map features that allow you to monitor your area from precipitation to air quality.

Radar, which stands for radio detection and ranging, has been around for almost as long as controlled flight. Robert Watson-Watt and Arnold Wilkins conducted the first experiments that led to a ...

We open on a simple question: how do you make a fighter disappear from radar without changing its shape? In this episode we trace radar-absorbing materials from German U-boat periscopes to modern ...

If you wanted to check someone's pulse from across the room, for example to remotely monitor an elderly relative, how could you do it? You might think it's impossible, because common health-monitoring ...