Neon sign and gutenberg printing press: what they have in common

1. Step 1. Neon sign — has part — Transformer. A high-voltage transformer.
2. Step 2. Transformer — is part of — Nuclear power plant. Transformers step up the voltage so the plant's power can travel far.
3. Step 3. Nuclear power plant — has part — Steam turbine. Steam turns the turbines — as at a thermal station.
4. Step 4. Steam turbine — evolved from — Watt steam engine. The turbine replaced piston engines in large installations.
5. Step 5. Watt steam engine — is part of — Rotary printing press. The first rotary presses were steam-driven.
6. Step 6. Rotary printing press — evolved from — Gutenberg printing press. Cylinders instead of a flat press.

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