Sous vide and r-7 rocket: what they have in common

1. Step 1. Sous vide — uses — Vacuum sealer. Vacuum bags.
2. Step 2. Vacuum sealer — uses — Cling film. Film.
3. Step 3. Cling film — is made of — Polyethylene. Polyethylene.
4. Step 4. Polyethylene — is made of — Crude oil. Made from petroleum products.
5. Step 5. Crude oil — is material for — Kerosene. A fraction of crude oil.
6. Step 6. Kerosene — is material for — R-7 rocket. The fuel is kerosene.

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