Mobile app and screw press: what they have in common

1. Step 1. Mobile app — is used in — Ride-hailing app. An app.
2. Step 2. Ride-hailing app — uses — Online maps. A map and a route.
3. Step 3. Online maps — evolved from — Map. A digital map.
4. Step 4. Map — includes — Mercator projection. A projection.
5. Step 5. Mercator projection — uses — Gutenberg printing press. Maps were printed in large numbers.
6. Step 6. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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