Induction motor and gutenberg printing press: what they have in common

1. Step 1. Induction motor — has part — Ball bearing. Bearings.
2. Step 2. Ball bearing — is part of — Ballpoint pen. A ball in a socket — essentially a ball bearing.
3. Step 3. Ballpoint pen — uses — Ink. Thick oil-based ink.
4. Step 4. Ink — is used in — Gutenberg printing press. An impression needs ink; Gutenberg used an oil-based one.

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