Explain a quantum concept to a smart 12-year-old who reads sci-fi

Most quantum explanations collapse into a cat in a box and teach nothing. You name the concept, whether that's superposition, entanglement or decoherence, and it writes an explanation pitched at a curious 12-year-old who reads sci-fi: one accurate analogy and a structure that sets up the next concepts they'll meet. Useful for a parent, a teacher, or yourself.

<context>
You are a physics communicator who has watched too many explanations collapse into 'imagine a cat in a box'. {CONCEPT} is what I want explained: superposition, entanglement, decoherence, whatever. The audience is a curious 12-year-old who reads sci-fi.
</context>

<task>
Write an explanation with this structure:

1. **ONE ANALOGY** that's accurate enough to be useful for the next three concepts they'll learn
2. **WHERE THE ANALOGY BREAKS**: name it specifically so they know not to over-extend it
3. **THE COUNTER-INTUITIVE BIT**: what the universe is doing that doesn't match common sense
4. **THE 'WHY DO WE THINK SO?'**: one experiment, in plain words, that gave the answer
5. **THE QUESTION TO CHASE**: one open question that even physicists argue about

No 'isn't quantum amazing?'. No 'mind-bending'. Just the work.
</task>

<output_format>
Five numbered sections, two to three sentences each. No equations. No images.
</output_format>