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Amazon Cloud Cam vs. Nest Cam vs. Arlo: Which connected camera should you buy?

Whether you want to keep an eye on things inside or out, Amazon, Nest and Arlo have some great options for home security cameras. There’s hardly a dearth of home security cameras these days. Long gone is the necessity of professional installation — now it’s just a matter of figuring out where you want a camera, and connecting an app. Wires? Those are optional these days. Here’s a top-down look at three of the more popular plug-and-play security camera systems: Nest Cam, Amazon Cloud Cam, and Netgear’ Arlo. Two of the…

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Clues In That Mysterious Radioactive Cloud Point Toward Russia

Enlarge this image The core of the RBT-3 reactor at the Research Institute of Atomic Reactors in Dimitrovgrad, Russia. Some scientists suspect the institute’s work on medical isotopes might explain radioactivity detected over Europe. Sovfoto/UIG via Getty Images hide caption toggle caption Sovfoto/UIG via Getty Images The tiny nation of Denmark has just three stations for monitoring atmospheric radiation. Each week, scientists change out air filters in the detectors and take the used ones to a technical university near Copenhagen. There, Sven Poul Nielsen and other researchers analyze the filters…

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