Erwin Schrödinger’s cat first appeared in 1935. It may still be alive. It’s hard to say.
That kitty revealed a world where cause and effect do not work the way we expect.
This may blow your mind a little.
I wrote about the cat in my book, Is the World Running Down? (1988), pp. 27-28. You can download for free it here.
If you think that cat is mind-blowing, wait until you read about Bell’s theorem.