Woofer speaker driver and stone tool: what they have in common

1. Step 1. Woofer speaker driver — is part of — Subwoofer. A loudspeaker with a large cone.
2. Step 2. Subwoofer — is a kind of — Loudspeaker. A loudspeaker.
3. Step 3. Loudspeaker — is made of — Paper. The cone is paper.
4. Step 4. Paper — is material for — Fire lance. The barrel of a fire lance is a paper or bamboo tube.
5. Step 5. Fire lance — evolved from — Spear. The fire lance was a spear with a tube of gunpowder — the first step to firearms.
6. Step 6. Spear — has part — Stone tool. Early spearheads were made of stone.

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