Stone core and gutenberg printing press: what they have in common

1. Step 1. Stone core — is part of — Stone tool. A pebble from which flakes are struck.
2. Step 2. Stone tool — is part of — Spear. Early spearheads were made of stone.
3. Step 3. Spear — evolved into — Fire lance. The fire lance was a spear with a tube of gunpowder — the first step to firearms.
4. Step 4. Fire lance — is made of — Paper. The barrel of a fire lance is a paper or bamboo tube.
5. Step 5. Paper — is used in — Gutenberg printing press. The impression is made on paper.

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