Paddle wheel and chisel: what they have in common

1. Step 1. Paddle wheel — works like — Water wheel. A water wheel in reverse: instead of water turning the wheel, the wheel pushes the water.
2. Step 2. Water wheel — is part of — Gunpowder mill. The drive.
3. Step 3. Gunpowder mill — uses — Gunpowder. Production.
4. Step 4. Gunpowder — evolved into — Dynamite. A replacement for gunpowder in mining.
5. Step 5. Dynamite — is used in — Tunnel. Drilling and blasting.
6. Step 6. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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