Rocket fins and incandescent light bulb: what they have in common

1. Step 1. Rocket fins — is part of — Rocket. Tail feathers or a stick keep the rocket on course.
2. Step 2. Rocket — uses — Reaction force. A rocket moves by reaction force.
3. Step 3. Reaction force — is used in — Ion thruster. Jet thrust.
4. Step 4. Ion thruster — is made of — Tungsten. The cathodes are tungsten.
5. Step 5. Tungsten — is material for — Incandescent light bulb. A tungsten filament (since 1904–1910).

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