Karaoke and steam locomotive: what they have in common

1. Step 1. Karaoke — has part — Microphone. A microphone.
2. Step 2. Microphone — has part — Diaphragm. The diaphragm vibrates under a sound wave.
3. Step 3. Diaphragm — is part of — Phonograph. A diaphragm with a needle.
4. Step 4. Phonograph — is made of — Tin. The recording is on tin foil.
5. Step 5. Tin — is material for — Model railway. The first models were tinplate.
6. Step 6. Model railway — works like — Steam locomotive. A model.

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