Oxygen and aeroplane: what they have in common

1. Step 1. Oxygen — is material for — V-2 rocket. The oxidizer is liquid oxygen.
2. Step 2. V-2 rocket — evolved into — Saturn V. Von Braun went from the V-2 to the Saturn.
3. Step 3. Saturn V — uses — Lunar module. It launched the lunar module.
4. Step 4. Lunar module — has part — Landing gear. Legs.
5. Step 5. Landing gear — is part of — Aeroplane. Landing gear.

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