For 600 years the Voynich manuscript has remained a mystery—now, researchers think it's partly about sex

The Voynich manuscript has long puzzled and fascinated historians and the public. This late-medieval document is covered in illustrations of stars and planets, plants, zodiac symbols, naked women, and blue and green fluids. But the text itself—thought to be the work of five different scribes—is enciphered and yet to be understood.