Oscilloscope and sickle: what they have in common

1. Step 1. Oscilloscope — has part — Cathode-ray tube. The first ones used CRTs.
2. Step 2. Cathode-ray tube — uses — Electromagnetism. The beam is deflected by a magnetic field.
3. Step 3. Electromagnetism — is used in — Starter motor. A starter is an electric motor.
4. Step 4. Starter motor — evolved from — Crank. It replaced the starting crank.
5. Step 5. Crank — is part of — Reaper. A crank moves the knife.
6. Step 6. Reaper — evolved from — Sickle. Mechanical reaping.

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