Aside from extreme animal cruelty, this thought experiment purposed by Erwin Schrodinger in 1935 was to show the absurdity of quantum theory. He basically put a cat in a box with a radioactive substance and trigger to unleash the substance…with no way of knowing whether or not the trigger unleashed the radioactive substance that would kill the cat, superposition occurs where the cat is both alive and dead at the same time until you open the box, thus creating two realities.
In the future, this theory combined with the work done at CERN, will become symbiotic.