IRC e railway semaphore: o que têm em comum

1. Passo 1. IRC — evoluiu para — Instant messenger. Chats.
2. Passo 2. Instant messenger — evoluiu de — SMS. Messengers displaced SMS.
3. Passo 3. SMS — funciona como — Electrical telegraph. A short text message is the heir of the telegram.
4. Passo 4. Electrical telegraph — evoluiu de — Optical telegraph. The electrical telegraph replaced semaphore lines.
5. Passo 5. Optical telegraph — evoluiu para — Railway semaphore. The semaphore idea.

Abrir Evothings