Stuck without eclipse-safe glasses? There are still options to watch the eclipse, using materials found at home.

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To make projective glass, Hall used a piece of plexiglass, a small mirror (the type that might come in a makeup compact) and a plastic reading magnifier. The instructions include CAD files for 3D ...

This old-school idea on how to repurpose 3D viewers shows us how much—and how little—the technology has changed.