Thermocouple and bell: what they have in common

1. Step 1. Thermocouple — is part of — Radioisotope generator. Thermocouples turn heat into current.
2. Step 2. Radioisotope generator — is part of — Space probe. The Voyagers’ RTGs.
3. Step 3. Space probe — has part — Radio module and antenna. Communication with Earth.
4. Step 4. Radio module and antenna — is part of — Smartphone. Connection to the cellular network, Wi-Fi, Bluetooth and satellite navigation.
5. Step 5. Smartphone — evolved from — Alarm clock. The alarm clock moved into the phone.
6. Step 6. Alarm clock — has part — Bell. A bell rings.

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