Podcast and archimedes’ screw: what they have in common

1. Step 1. Podcast — uses — MP3. Audio files.
2. Step 2. MP3 — is used in — Smartphone. The smartphone absorbed the functions of the digital player.
3. Step 3. Smartphone — has part — Smartphone camera. One or more 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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