Wing warping and atomic clock: what they have in common

1. Step 1. Wing warping — evolved into — Aileron. Ailerons replaced wing warping.
2. Step 2. Aileron — is part of — Aeroplane. Ailerons.
3. Step 3. Aeroplane — is a kind of — Aircraft. An aircraft.
4. Step 4. Aircraft — includes — Military drone. An aircraft.
5. Step 5. Military drone — has part — GPS (satellite navigation). Satellite navigation.
6. Step 6. GPS (satellite navigation) — uses — Atomic clock. The satellites carry atomic clocks; the position is calculated from signal arrival times.

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