Subject

Quantum Weirdness Unpacked

What does it actually mean for a particle to be in superposition? What happens when we 'look'? Why don't cats appear half-alive? The deeper conceptual layer of quantum mechanics — measurement, decoherence, Bell's theorem, and the many-worlds question.

Articles

Bell's Theorem Explained — The Proof That Quantum Weirdness Is Real John Bell proved in 1964 that no theory of local hidden variables can reproduce all quantum predictions. Experiments since the 1970s have confirmed quantum mechanics over local hidden variables. The 2022 Nobel Prize honored this work.
What Decoherence Actually Is — Why Cats Don't Look Half-Alive Decoherence is the process by which a quantum superposition appears to lose its coherence as the system interacts with its environment. The system's quantum state effectively becomes a probabilistic mixture — explaining why macroscopic objects look classical.

Where to go next

A short editorial reading list. Pick whichever fits how you like to learn.

Wikipedia: the formal definition, cross-references, and citations

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