Galileo

Galileo was an Italian physicist, mathematician, astronomer and philosopher who played the first role in the Scientific Revolution. He dropped two cannonballs from the top of the Leaning Tower of Pisa in Italy in the episode "Ants in Arthur's Pants" to prove that gravity affects two differently sized objects equally. He was also mentioned in "Dad's Dessert Dilemma" where the class threw a party to celebrate his birthday. He was also mentioned in "Arthur's Treasure Hunt" when Arthur imagined Galileo's father making him go to bed because he stayed up too late discovering moons of Jupiter.