Xylophone and hammer: what they have in common

1. Step 1. Xylophone — uses — Resonance. Resonating bars.
2. Step 2. Resonance — is used in — Flute. Resonance of the air column.
3. Step 3. Flute — is made of — Bone. The oldest flutes (Hohle Fels) were carved from bird bone and ivory.
4. Step 4. Bone — is material for — Needle. The first needles with an eye were carved from bone.
5. Step 5. Needle — evolved from — Stone tool. Bone needles with an eye are part of the Palaeolithic toolkit.
6. Step 6. Stone tool — evolved into — Hammer. The first hammer was a stone in the hand.

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