Mixer and greenhouse: what they have in common

1. Step 1. Mixer — evolved from — Egg beater. A motorized whisk.
2. Step 2. Egg beater — is made of — Tin. The whisk is tinned sheet metal.
3. Step 3. Tin — is used in — Float glass. Glass spreads out over molten tin.
4. Step 4. Float glass — is material for — Window glass. Float glass.
5. Step 5. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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