Isaac Newton e la gattaiola

Si dice che sir Isaac Newton abbia inventato la gattaiola.
Lo hanno detto anche a History Channel:

I was watching an interesting programme on the history channel this morning over breakfast - Local Heroes. According to Adam Hart-Davis, Isaac Newton became distracted from his experiments by his cat being on the wrong side of the door. Now anyone who has cats knows that they are always on the wrong side of the door - it’s one of the great feline laws of the universe.Newton’s solution was to cut a hole in the door and put cloth over it to keep the draught out. The cat could then come and go as it wished. So, Isaac Newton demonstrated that light was made up of different colours and gave us an insight into gravitational pull. A master of physics, he also gave us the catflap - which, I wonder, was his most important achievement?

From Wiki:
A cat flap (British English) or kitty door (American English) is a hinged flap set into a door, wall or window to allow cats to enter and exit a house on their own without needing a human to open the door, while offering a degree of protection against wind and rain entering the dwelling.