Radio transceiver and LIGO: what they have in common

1. Step 1. Radio transceiver — is part of — Military radio. A radio unit.
2. Step 2. Military radio — has part — Antenna. It needs an antenna.
3. Step 3. Antenna — is part of — Crystal radio. An antenna.
4. Step 4. Crystal radio — has part — Diode. A crystal detector is a diode.
5. Step 5. Diode — includes — Photodiode. A kind of diode.
6. Step 6. Photodiode — is part of — LIGO. A photodetector of the interference.

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