Motor scooter and radio: what they have in common

1. Step 1. Motor scooter — has part — Internal combustion engine. A two-stroke engine.
2. Step 2. Internal combustion engine — is part of — Airship. Internal combustion engines.
3. Step 3. Airship — uses — Hydrogen. Zeppelins were filled with hydrogen.
4. Step 4. Hydrogen — is material for — Weather balloon. Filled with hydrogen or helium.
5. Step 5. Weather balloon — has part — Radio. A radiosonde.

Open Evothings