Do you know the famous Renaissance genius Leonardo da Vinci? Did you know that, besides being the painter of the famous Mona Lisa, da Vinci was also a phenomenal inventor? Assemble and play with two of the machines that da Vinci designed - the catapult and the crossbow - and see how every detail of your models faithfully follows the original designs of the great Leonardo! Read the 14-page book and learn more about the interesting life and ideas of the Italian genius. Discover how his inventions worked and how some of his ideas are still used today!