Hydrofoil and gutenberg printing press: what they have in common

1. Step 1. Hydrofoil — has part — Hull. A hull.
2. Step 2. Hull — is part of — Boat. A hull.
3. Step 3. Boat — evolved into — Sailing ship. Sailing ships grew out of rowing boats.
4. Step 4. Sailing ship — uses — Mercator projection. Navigating along straight rhumb lines.
5. Step 5. Mercator projection — uses — Gutenberg printing press. Maps were printed in large numbers.

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