Amplitude and frequency modulation and zip: what they have in common

1. Step 1. Amplitude and frequency modulation — uses — Electromagnetic waves. The carrier wave is modulated.
2. Step 2. Electromagnetic waves — evolved from — Electromagnetic induction. Maxwell’s equations, which generalized induction, predicted electromagnetic waves.
3. Step 3. Electromagnetic induction — is used in — Electric toothbrush. Wireless charging by induction.
4. Step 4. Electric toothbrush — is made of — Nylon. The bristles are nylon.
5. Step 5. Nylon — is material for — Backpack. Nylon.
6. Step 6. Backpack — has part — Zip. Zips.

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