Imagine a cat in a box, but you can't see the cat. You're not even sure if there is a cat in the box or not. This is the fundamental problem faced by Werner Heisenberg, the father of Quantum Mechanics. He was trying to measure the cat, but the cat was being very unhelpful.
According to Heisenberg, the act of observing something can change its state. If you observe the cat, it becomes a cat. But if you don't observe it, it might not be a cat at all. It's like trying to take a selfie with a cat that's having an existential crisis.
Heisenberg's thought experiment involves a cat in a box with a radioactive atom that might or might not decay. If it decays, the cat is released. But if it doesn't decay, the cat stays in the box. This is like trying to predict the weather, but with more cat hair.
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Cat's Thoughts on Observation and Uncertainty