BBS and rolling mill: what they have in common

1. Step 1. BBS — uses — Modem. Access by modem.
2. Step 2. Modem — uses — Telephone. It works over a telephone line.
3. Step 3. Telephone — evolved from — Electrical telegraph. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).
4. Step 4. Electrical telegraph — is used in — Time zones. Synchronizing time by telegraph.
5. Step 5. Time zones — was inspired by — Railway track. Introduced because of railway timetables.
6. Step 6. Railway track — uses — Rolling mill. Rails are rolled.

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