Smart TV and vacuum pump: what they have in common

1. Step 1. Smart TV — is a kind of — Television set. A smart TV is a television with a built-in computer and internet.
2. Step 2. Television set — has part — Cathode-ray tube. A picture tube.
3. Step 3. Cathode-ray tube — evolved into — Electron. Thomson discovered the electron in cathode rays.
4. Step 4. Electron — is used in — Electron microscope. A beam of electrons instead of light.
5. Step 5. Electron microscope — has part — Vacuum pump. A vacuum in the column.

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