The Voynich manuscript contains two distinct writing styles that a mathematical model can identify with 89 percent accuracy.

A Beta-Binomial mixture model confirmed the existence of two structural languages known as the Currier A and B split. This mysterious book has puzzled cryptographers for centuries with its undecipherable text and strange illustrations. Many scholars thought the manuscript was a single unified work or perhaps a meaningless hoax. The statistical evidence proves that at least two different authors or systems were used to create the text. This finding provides a concrete foundation for future attempts to finally decode what the manuscript actually says.