Irrigation and camera: what they have in common

1. Step 1. Irrigation — uses — Archimedes’ screw. The Archimedes’ screw lifted water for irrigation.
2. Step 2. Archimedes’ screw — evolved into — Propeller. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.
3. Step 3. Propeller — is part of — Quadcopter (drone). Air propellers.
4. Step 4. Quadcopter (drone) — has part — Smartphone camera. A camera.
5. Step 5. Smartphone camera — evolved from — Camera. A smartphone camera keeps the layout of a camera: a lens forms an image on a light-sensitive surface.

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