Ammonia and telescope: what they have in common

1. Step 1. Ammonia — is material for — Maser. The first maser ran on ammonia.
2. Step 2. Maser — evolved into — Laser. A laser is an optical maser.
3. Step 3. Laser — is used in — Laser surgery. A laser.
4. Step 4. Laser surgery — works like — Glasses. Laser vision correction solves the same problem as glasses — it changes refraction, but in the cornea itself.
5. Step 5. Glasses — evolved into — Telescope. The first telescopes were assembled by spectacle makers.

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