Greek fire and aeroplane: what they have in common

1. Step 1. Greek fire — uses — Piston pump. It was projected by a siphon pump.
2. Step 2. Piston pump — has part — Piston. The piston draws in and pushes out liquid.
3. Step 3. Piston — is part of — Shock absorber. Inside, a piston moves in oil.
4. Step 4. Shock absorber — is part of — Landing gear. Shock struts.
5. Step 5. Landing gear — is part of — Aeroplane. Landing gear.

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