Tea bag and windlass: what they have in common

1. Step 1. Tea bag — is made of — Paper. Filter paper.
2. Step 2. Paper — is material for — Fire lance. The barrel of a fire lance is a paper or bamboo tube.
3. Step 3. Fire lance — evolved from — Spear. The fire lance was a spear with a tube of gunpowder — the first step to firearms.
4. Step 4. Spear — evolved into — Harpoon. A spear with barbs.
5. Step 5. Harpoon — has part — Rope. A line connects the head to the hunter.
6. Step 6. Rope — is part of — Windlass. A rope.

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