@stormyknight: Da Vinci is also credited for inventing the scissors. The Romans created the concept of scissors but Da Vinci came up with two separate pieces of metal attached at a central pivot point, used to cut things. Da Vinci designed a movable bridge for the Duke of Milan. He invented the bicycle about 300 hundred years before it ever appeared on the road.
Regarding the Mona Lisa painting, it has been said that it took Da Vinci 10 years to paint her lips. An unusual hypothesis about the Mona Lisa is that it was meant to be a self-portrait of Leonardo as a woman.