Gun barrel and chisel: what they have in common

1. Step 1. Gun barrel — is part of — Hand cannon. A short metal tube.
2. Step 2. Hand cannon — uses — Gunpowder. Gunpowder propels the projectile.
3. Step 3. Gunpowder — evolved into — Dynamite. A replacement for gunpowder in mining.
4. Step 4. Dynamite — is used in — Tunnel. Drilling and blasting.
5. Step 5. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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