Paper bag and archimedes’ screw: what they have in common

1. Step 1. Paper bag — is made of — Paper. Paper.
2. Step 2. Paper — is material for — Hot air balloon. It was lined with paper on the inside.
3. Step 3. Hot air balloon — evolved into — Airship. A steerable balloon.
4. Step 4. Airship — has part — Propeller. Air propellers.
5. Step 5. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.

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