Anyone who’s navigated over land in the military has probably used a lensatic compass. Lensatic compasses contain a glow-in-the-dark chemical called tritium, a self-powered lighting source that ...

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Most of us take for granted the fact that, when we need to drive to an Airbnb we rented for a weekend, or get to a new restaurant we saw on Instagram, our phones draw an imaginary line directly from ...