On August 21, the United States will witness a total solar eclipse, the first for almost 99 years. It’s a once-in-a-lifetime event, and it’s unlikely that we’ll see anything like it ever again. Suffice to say, America’s gone eclipse-crazy, with hotel rooms in the best viewing locations going for thousands of dollars a night. But to observe the spectacle without frying your retinas, you need special filtered glasses that conform to the ISO 12312-2 safety standards. Unfortunately though, some folks are flogging ordinary shades and handheld viewers with labels falsely stating they conform to the standard. According to the American Astronomical…

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