Lens and heat pump: what they have in common

1. Step 1. Lens — is part of — Spectroscope. A collimator.
2. Step 2. Spectroscope — is used in — Helium. Helium was discovered by spectroscopy in the solar spectrum.
3. Step 3. Helium — is material for — Large Hadron Collider. It is cooled with superfluid helium.
4. Step 4. Large Hadron Collider — uses — Data centre. A grid for processing data.
5. Step 5. Data centre — has part — Air conditioner. Cooling.
6. Step 6. Air conditioner — uses — Heat pump. An air conditioner is a heat pump that carries heat out of the room.

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