Dish antenna and vacuum pump: what they have in common

1. Step 1. Dish antenna — is part of — Radio telescope. A parabolic antenna.
2. Step 2. Radio telescope — is a kind of — Telescope. A telescope for radio waves.
3. Step 3. Telescope — evolved from — Glasses. The first telescopes were assembled by spectacle makers.
4. Step 4. Glasses — evolved into — Microscope. Spectacle makers assembled the first microscopes.
5. Step 5. Microscope — evolved into — Electron microscope. Overcoming the limit of optics.
6. Step 6. Electron microscope — has part — Vacuum pump. A vacuum in the column.

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