Spinning mule and oil well: what they have in common

1. Step 1. Spinning mule — uses — Cotton. It spins fine cotton thread.
2. Step 2. Cotton — is material for — Surgical mask. Mikulicz’s masks were gauze.
3. Step 3. Surgical mask — is made of — Polyethylene. Non-woven polypropylene.
4. Step 4. Polyethylene — is made of — Crude oil. Made from petroleum products.
5. Step 5. Crude oil — uses — Oil well. Oil is extracted from wells.

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