Based on Rachel Ignotofsky's best-selling book, Women in Science: 50 Fearless Pioneers Who Changed the World. Each full-colour monthly spread showcases one of the women from her book, including Wang Zhenyi, the astronomer who, in the 1700s, figured out how an eclipse occurs, or Nettie Stevens, the geneticist who discovered that the sex of a baby is determined by X and Y chromosomes. Monthly wall calendar (30,5 x 30,50 cm).