Fish hook and incandescent light bulb: what they have in common

1. Step 1. Fish hook — is made of — Bone. Ancient hooks were carved from shell and bone.
2. Step 2. Bone — is material for — Toothbrush. Addis’s toothbrush has a bone handle.
3. Step 3. Toothbrush — is made of — Plant fibre. The bristles were hog hair, later nylon.
4. Step 4. Plant fibre — is material for — Wick. A wick is twisted from plant fibres.
5. Step 5. Wick — is part of — Oil lamp. The wick feeds oil to the flame.
6. Step 6. Oil lamp — evolved into — Incandescent light bulb. The electric lamp replaced oil and gas lamps.

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