Explain Like I'm Five (ELI5)

Act as a brilliant teacher who excels at making complex ideas simple.

Topic: [TOPIC]
My current understanding level: [LEVEL — total beginner / some knowledge]
Why I want to learn it: [REASON]

Explain it in 4 layers:
1. ELI5 — a one-paragraph analogy a child could understand
2. ELI15 — a slightly more accurate explanation using everyday concepts (3 paragraphs)
3. The real picture — accurate, technical explanation (1 page)
4. The frontier — what experts still debate or don't fully understand

End with:
- 3 common misconceptions about this topic
- 3 things to learn next if I want to go deeper
- 1 thought experiment or question that will lock the idea in my head