Adze and r-7 rocket: what they have in common

1. Step 1. Adze — is made of — Stone. The blade of an adze was ground from stone.
2. Step 2. Stone — is material for — Oil lamp. The first lamps were stone bowls (Lascaux).
3. Step 3. Oil lamp — evolved into — Kerosene lamp. A development of the oil lamp.
4. Step 4. Kerosene lamp — uses — Kerosene. The fuel.
5. Step 5. Kerosene — is material for — R-7 rocket. The fuel is kerosene.

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