Glasses and steam turbine: 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 — Reflecting telescope. A telescope.
3. Step 3. Reflecting telescope — has part — Mirror. The primary mirror.
4. Step 4. Mirror — is part of — Solar concentrator. Mirrors concentrate the light.
5. Step 5. Solar concentrator — has part — Steam turbine. Heated steam turns a turbine.

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