Germ theory of disease and GPS (satellite navigation): what they have in common

1. Step 1. Germ theory of disease — is used in — Surgical mask. Protection against droplets.
2. Step 2. Surgical mask — is made of — Polyethylene. Non-woven polypropylene.
3. Step 3. Polyethylene — is made of — Crude oil. Made from petroleum products.
4. Step 4. Crude oil — is material for — Kerosene. A fraction of crude oil.
5. Step 5. Kerosene — is material for — Reusable rocket. The fuel is kerosene or methane.
6. Step 6. Reusable rocket — has part — GPS (satellite navigation). Navigation during landing.

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