Morse code and chisel: what they have in common

1. Step 1. Morse code — is used in — Electrical telegraph. Morse encoding.
2. Step 2. Electrical telegraph — is used in — Time zones. Synchronizing time by telegraph.
3. Step 3. Time zones — was inspired by — Railway track. Introduced because of railway timetables.
4. Step 4. Railway track — is used in — Metro. It runs on rails.
5. Step 5. Metro — uses — Tunnel. Tunnels.
6. Step 6. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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