Flywheel energy storage and typewriter: what they have in common

1. Step 1. Flywheel energy storage — has part — Flywheel. A flywheel.
2. Step 2. Flywheel — is part of — Watt steam engine. The flywheel evens out rotation.
3. Step 3. Watt steam engine — is part of — Rotary printing press. The first rotary presses were steam-driven.
4. Step 4. Rotary printing press — evolved from — Gutenberg printing press. Cylinders instead of a flat press.
5. Step 5. Gutenberg printing press — has part — Movable type. Text is set from metal type.
6. Step 6. Movable type — works like — Typewriter. Each typebar carries a piece of movable type pressed against the paper.

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