Angels, animals, hand gestures—none of it is random. Medieval artists filled their work with layered symbols meant to teach, warn, or praise. Once you know what to look for, the meaning changes ...

The solution to a 35-year-old puzzle has finally been found, by chance, in the archives of the Smithsonian Institution. The top-secret code could be used to solve Kryptos, an infamously enigmatic ...

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