Isaacs Newton invented the catflap (that bit is actually true.)
However, his idea was to use it as an early type of letterbox. The plan fell flat as there was no postal service at the time, so he let the cats use it instead.
Charles Darwin was the first to note the adaptability of cats in his theory of natural selection, and that they could learn to use cat flaps to enter and exit his home.
On a related note, when the Chinese discovered the magnetic properties of Lodestone it was initially used as a tool in Feng Shui, the use of Lodestone in navigation came later.
The magnetic properties of Lodestones are caused by lightning strikes ⚡️
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