Ear loops and electric generator: what they have in common

1. Step 1. Ear loops — is part of — Surgical mask. Ear loops.
2. Step 2. Surgical mask — is made of — Polyethylene. Non-woven polypropylene.
3. Step 3. Polyethylene — is material for — Joint replacement. A polyethylene cup.
4. Step 4. Joint replacement — has part — Ball bearing. A “ball in a cup” joint — like a plain bearing.
5. Step 5. Ball bearing — is part of — Electric generator. Shaft bearings.

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