Paper bag side gussets and hammer: what they have in common

1. Step 1. Paper bag side gussets — is part of — Paper bag. They let the bag fold flat.
2. Step 2. Paper bag — is made of — Paper. Paper.
3. Step 3. Paper — is material for — Fire lance. The barrel of a fire lance is a paper or bamboo tube.
4. Step 4. Fire lance — evolved from — Spear. The fire lance was a spear with a tube of gunpowder — the first step to firearms.
5. Step 5. Spear — has part — Stone tool. Early spearheads were made of stone.
6. Step 6. Stone tool — evolved into — Hammer. The first hammer was a stone in the hand.

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