Tone holes and oil well: what they have in common

1. Step 1. Tone holes — is part of — Flute. They change the length of the sounding air column.
2. Step 2. Flute — is made of — Bone. The oldest flutes (Hohle Fels) were carved from bird bone and ivory.
3. Step 3. Bone — is material for — Toothbrush. Addis’s toothbrush has a bone handle.
4. Step 4. Toothbrush — is made of — Nylon. Nylon bristles (1938).
5. Step 5. Nylon — is made of — Crude oil. The raw material is petrochemical.
6. Step 6. Crude oil — uses — Oil well. Oil is extracted from wells.

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