Isaac Newton invented the doggy door  "Isaac Newton purportedly invented the cat flap (also known as the doggy door). He was said to put two cat flaps on his door, a large one and a small one, for his two pet cats."

Isaac Newton invented the doggy door

“Isaac Newton purportedly invented the cat flap (also known as the doggy door). He was said to put two cat flaps on his door, a large one and a small one, for his two pet cats.”

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