Atomic theory and telephone: what they have in common

1. Step 1. Atomic theory — evolved into — Electron. The atom turned out to be divisible.
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 — Television set. A picture tube.
4. Step 4. Television set — has part — Loudspeaker. Sound.
5. Step 5. Loudspeaker — is part of — Telephone. The earpiece reproduces the other person’s voice.

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