The 240-page Voynich Manuscript is written in an unknown language, sometimes called the “alien” book because no one has been able to read it.  Now, thanks to radiocarbon dating, a little less mystery surrounds the artifact.

Fox News reports that a team of physicists at the University of Arizona have dated the vellum manuscript between 1400 and 1438–making it at least twenty-five years older than the Gutenberg Bible.

Research scientist Greg Hodgins led the research team and offered this quote: “Is it a code, a cipher of some kind? People are doing statistical analysis of letter use and word use – the tools that have been used for code breaking. But they still haven’t figured it out.”

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