Weather satellite and gas lamp: what they have in common

1. Step 1. Weather satellite — has part — Thermal camera. Infrared radiometers.
2. Step 2. Thermal camera — has part — Image sensor. A microbolometer array.
3. Step 3. Image sensor — is part of — Computer mouse. The motion sensor is a tiny camera.
4. Step 4. Computer mouse — has part — LED. An optical mouse.
5. Step 5. LED — is part of — Street light. LEDs.
6. Step 6. Street light — evolved from — Gas lamp. Gas lamps.

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