Crystal radio and shipping container: what they have in common

1. Step 1. Crystal radio — has part — Antenna. An antenna.
2. Step 2. Antenna — is part of — Radar. An antenna emits and receives.
3. Step 3. Radar — is part of — Jet airliner. A weather radar.
4. Step 4. Jet airliner — has part — Wing. A swept wing.
5. Step 5. Wing — is part of — Cargo aircraft. Wings.
6. Step 6. Cargo aircraft — uses — Shipping container. Air cargo containers.

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