Soyuz and archimedes’ screw: what they have in common

1. Step 1. Soyuz — has part — Heat shield. A heat shield.
2. Step 2. Heat shield — is part of — Space Shuttle. Heat-shield tiles.
3. Step 3. Space Shuttle — has part — Wing. It landed like a glider.
4. Step 4. Wing — is part of — Seaplane. An aeroplane with wings.
5. Step 5. Seaplane — has part — Propeller. A propeller.
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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