Infrared radiation and rock drill: what they have in common

1. Step 1. Infrared radiation — is used in — Remote control. An infrared signal.
2. Step 2. Remote control — has part — LED. An infrared LED.
3. Step 3. LED — is part of — Street light. LEDs.
4. Step 4. Street light — is part of — Tunnel. Lighting.
5. Step 5. Tunnel — uses — Rock drill. Driving the Mont Cenis tunnel.

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