Blimp and laser: what they have in common

1. Step 1. Blimp — is a kind of — Airship. An airship.
2. Step 2. Airship — uses — Hydrogen. Zeppelins were filled with hydrogen.
3. Step 3. Hydrogen — is material for — Ammonia. Hydrogen.
4. Step 4. Ammonia — is material for — Maser. The first maser ran on ammonia.
5. Step 5. Maser — evolved into — Laser. A laser is an optical maser.

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