First Cat Door

The man history remembers as the brilliant discoverer of the theory of gravity, Sir Isaac Newton, was greatly devoted to his cat. When Newton noticed his pet had difficulty coming and going as he pleased because of closed winter doors, Newton (one of the world's greatest minds) took time out from his lofty thinking and invented the first cat-flap door.

Newton also had a dog, named Diamond. Visit our Anecdotes Archives to read more about him!

photo source: www.petdoorsusa.com/plexidor.html