As part of my research efforts for my new education company, I've been reading a lot about Isaac Newton. He is recognized as one of the great scientific geniuses, ranking alongside Einstein and Gauss. He invented calculus, the binomial theorem, discovered three laws of motion, and a bunch of other stuff.
But what most people don't know is that he also invented..... the cat flap.
Apparently his cat was disturbing him during his darkroom optic experiments, so he invented the flap to allow his cat to leave the house without requiring assistance.