BBS e rolling mill: o que têm em comum

1. Passo 1. BBS — utiliza — Modem. Access by modem.
2. Passo 2. Modem — utiliza — Telephone. It works over a telephone line.
3. Passo 3. Telephone — evoluiu de — Electrical telegraph. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).
4. Passo 4. Electrical telegraph — é utilizado em — Time zones. Synchronizing time by telegraph.
5. Passo 5. Time zones — foi inspirado por — Railway track. Introduced because of railway timetables.
6. Passo 6. Railway track — utiliza — Rolling mill. Rails are rolled.

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