Triode and greenhouse: what they have in common

1. Step 1. Triode — is made of — Tungsten. The filament is tungsten.
2. Step 2. Tungsten — is material for — Ion thruster. The cathodes are tungsten.
3. Step 3. Ion thruster — has part — Solar panel. Power supply.
4. Step 4. Solar panel — has part — Window glass. Tempered cover glass.
5. Step 5. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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