Glasses and greenhouse: what they have in common

1. Step 1. Glasses — evolved into — Telescope. The first telescopes were assembled by spectacle makers.
2. Step 2. Telescope — includes — Space telescope. A space telescope is a telescope above the atmosphere, so air does not blur the view.
3. Step 3. Space telescope — has part — Solar panel. Solar panels.
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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