Fish hook barb and transformer: what they have in common

1. Step 1. Fish hook barb — is part of — Fish hook. A reverse barb keeps the fish from getting off.
2. Step 2. Fish hook — is made of — Bone. Ancient hooks were carved from shell and bone.
3. Step 3. Bone — is material for — Toothbrush. Addis’s toothbrush has a bone handle.
4. Step 4. Toothbrush — evolved into — Electric toothbrush. A motorized toothbrush.
5. Step 5. Electric toothbrush — uses — Electromagnetic induction. Wireless charging by induction.
6. Step 6. Electromagnetic induction — is used in — Transformer. Induction between the windings.

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