Toothbrush bristles and router: what they have in common

1. Step 1. Toothbrush bristles — is part of — Toothbrush. Tufts of nylon filaments.
2. Step 2. Toothbrush — evolved into — Electric toothbrush. A motorized toothbrush.
3. Step 3. Electric toothbrush — uses — Electromagnetic induction. Wireless charging by induction.
4. Step 4. Electromagnetic induction — evolved into — Electromagnetic waves. Maxwell’s equations, which generalized induction, predicted electromagnetic waves.
5. Step 5. Electromagnetic waves — is used in — Radio module and antenna. The antenna emits and receives radio waves.
6. Step 6. Radio module and antenna — is part of — Router. A Wi-Fi access point.

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