Semiconductor doping and aeroplane: what they have in common

1. Step 1. Semiconductor doping — uses — Semiconductor. A semiconductor is doped.
2. Step 2. Semiconductor — is material for — Crystal radio. The detector is a galena crystal.
3. Step 3. Crystal radio — has part — Antenna. An antenna.
4. Step 4. Antenna — is part of — Radar. An antenna emits and receives.
5. Step 5. Radar — is part of — Jet airliner. A weather radar.
6. Step 6. Jet airliner — evolved from — Aeroplane. A jet aircraft.

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