Wagonway and radio: what they have in common

1. Step 1. Wagonway — evolved into — Railway track. Cast-iron and steel rails replaced wooden ones.
2. Step 2. Railway track — inspired — Time zones. Introduced because of railway timetables.
3. Step 3. Time zones — uses — Electrical telegraph. Synchronizing time by telegraph.
4. Step 4. Electrical telegraph — uses — Morse code. Morse encoding.
5. Step 5. Morse code — is used in — Radio. The first radio transmissions were in Morse code.

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