Comb spine and car: what they have in common
- Step 1. Comb spine — is part of — Comb. The base that holds the teeth.
- Step 2. Comb — is made of — Bone. Ancient combs were carved from bone and antler.
- Step 3. Bone — is material for — Toothbrush. Addis’s toothbrush has a bone handle.
- Step 4. Toothbrush — is made of — Nylon. Nylon bristles (1938).
- Step 5. Nylon — is material for — Airbag. The airbag is nylon.
- Step 6. Airbag — is part of — Car. Airbags.