Germanium and archimedes’ screw: what they have in common

1. Step 1. Germanium — is material for — Thermal camera. Thermal camera lenses are germanium.
2. Step 2. Thermal camera — is part of — Weather satellite. Infrared radiometers.
3. Step 3. Weather satellite — has part — Smartphone camera. Cameras.
4. Step 4. Smartphone camera — is part of — Quadcopter (drone). A camera.
5. Step 5. Quadcopter (drone) — has part — Propeller. Air propellers.
6. Step 6. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.

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