This 15th century codex is written in a completely unknown script that no one can read.
Carbon dating confirms the vellum pages were created between 1404 and 1438.
Handwriting analysis suggests the book was the work of five different scribes.
It is filled with bizarre illustrations of unidentified plants, constellations, and bathing women.
Top theories range from a complex medieval cipher to an elaborate, meaningless hoax.
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