Electron microscope and personal computer: what they have in common

1. Step 1. Electron microscope — uses — Electron. A beam of electrons instead of light.
2. Step 2. Electron — evolved from — Cathode-ray tube. Thomson discovered the electron in cathode rays.
3. Step 3. Cathode-ray tube — is part of — Monitor. The first monitors were CRTs.
4. Step 4. Monitor — is part of — Personal computer. A monitor.

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