Lift and oil lamp: what they have in common

1. Step 1. Lift — is used in — Flaps. More lift at low speed.
2. Step 2. Flaps — is part of — Jet airliner. Flaps.
3. Step 3. Jet airliner — has part — Turbojet engine. Jet engines.
4. Step 4. Turbojet engine — uses — Kerosene. Jet fuel is kerosene.
5. Step 5. Kerosene — is used in — Kerosene lamp. The fuel.
6. Step 6. Kerosene lamp — evolved from — Oil lamp. A development of the oil lamp.

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