Isaac Newton purportedly invented the cat flap. He was said to put two cat flaps on his door, a large one and a small one, for his two pet cats.
Tokyoflash Treasure Hunt - Win a Tokyoflash Watch of Your Choice!
Going on right now: Tokyoflash Treasure Hunt #26. Win a Tokyoflash watch and neat stuff from the NeatoShop. It's fun and easy to play: Link