Infrared thermometer e railway semaphore: o que têm em comum

1. Passo 1. Infrared thermometer — utiliza — Infrared radiation. The infrared radiation of a body.
2. Passo 2. Infrared radiation — é utilizado em — Remote control. An infrared signal.
3. Passo 3. Remote control — tem como parte — LED. An infrared LED.
4. Passo 4. LED — faz parte de — Traffic light. LEDs.
5. Passo 5. Traffic light — evoluiu de — Railway semaphore. The first traffic light was a railway-style semaphore.

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