Rocket and saw: what they have in common

1. Step 1. Rocket — uses — Gunpowder. The first rockets were powered by gunpowder.
2. Step 2. Gunpowder — is used in — Gunpowder mill. Production.
3. Step 3. Gunpowder mill — has part — Water wheel. The drive.
4. Step 4. Water wheel — is part of — Sawmill. Early sawmills were driven by water wheels.
5. Step 5. Sawmill — uses — Saw. The cutting tool is a saw.

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