Surprising Inventions by Famous People - DivineCaroline

Surprising Inventions by Famous People - DivineCaroline: "Supposedly, when Newton was studying the physical properties of light, his cat often tried to get into the room to be with him. Nudging the door open, though, allowed in extra daylight and ruined the experiments. Newton, who liked having his feline companion nearby, cut a hole in the door and covered it with felt, so that kitty could come and go without disturbing his laboratory. When the cat had kittens, he even cut tiny flaps into the wood for them to use."