Darts and headphones: what they have in common

1. Step 1. Darts — is made of — Plant fibre. Modern ones are made of compressed sisal.
2. Step 2. Plant fibre — is material for — Toothbrush. The bristles were hog hair, later nylon.
3. Step 3. Toothbrush — is made of — Bone. Addis’s toothbrush has a bone handle.
4. Step 4. Bone — is material for — Bit and bridle. Early cheekpieces were carved from antler and bone.
5. Step 5. Bit and bridle — has part — Headband. Straps on the head.
6. Step 6. Headband — is part of — Headphones. A band that presses the cups.

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