Maxwell’s equations and needle: what they have in common

1. Step 1. Maxwell’s equations — evolved from — Electromagnetic induction. A generalization of Faraday.
2. Step 2. Electromagnetic induction — is used in — Electric toothbrush. Wireless charging by induction.
3. Step 3. Electric toothbrush — evolved from — Toothbrush. A motorized toothbrush.
4. Step 4. Toothbrush — is made of — Bone. Addis’s toothbrush has a bone handle.
5. Step 5. Bone — is material for — Needle. The first needles with an eye were carved from bone.

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