Mortar and turbojet engine: what they have in common

1. Step 1. Mortar — is part of — Paved road. Roman roads had layers set in mortar.
2. Step 2. Paved road — is made of — Asphalt. Asphalt.
3. Step 3. Asphalt — is material for — Airport. Or asphalt.
4. Step 4. Airport — uses — Radar. Radars.
5. Step 5. Radar — is part of — Jet fighter. A radar.
6. Step 6. Jet fighter — has part — Turbojet engine. A turbojet.

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