Kerosene and telescope: what they have in common

1. Step 1. Kerosene — is used in — Kerosene lamp. The fuel.
2. Step 2. Kerosene lamp — evolved from — Oil lamp. A development of the oil lamp.
3. Step 3. Oil lamp — is used in — Magic lantern. The light source is an oil lamp.
4. Step 4. Magic lantern — has part — Lens. Lenses.
5. Step 5. Lens — is part of — Telescope. An objective and an eyepiece.

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