Laser cutting and data centre: what they have in common

1. Step 1. Laser cutting — uses — Laser. A laser.
2. Step 2. Laser — evolved from — Maser. A laser is an optical maser.
3. Step 3. Maser — is made of — Ammonia. The first maser ran on ammonia.
4. Step 4. Ammonia — is material for — Refrigerant. Ammonia was one of the first refrigerants.
5. Step 5. Refrigerant — is material for — Air conditioner. Inside is a refrigerant.
6. Step 6. Air conditioner — is part of — Data centre. Cooling.

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