Dentures and multistage rocket: what they have in common

1. Step 1. Dentures — is made of — Porcelain. Porcelain teeth.
2. Step 2. Porcelain — is material for — Spark plug. The insulator is ceramic.
3. Step 3. Spark plug — is made of — Nickel. The electrodes are a nickel alloy.
4. Step 4. Nickel — is material for — Afterburner. The chamber is made of nickel superalloys.
5. Step 5. Afterburner — uses — Kerosene. It burns extra fuel in the exhaust.
6. Step 6. Kerosene — is material for — Multistage rocket. The fuel is kerosene.

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