Conservação da energia e optical telegraph: o que têm em comum

1. Passo 1. Conservação da energia — é utilizado em — Roller coaster. Potential energy turns into kinetic energy.
2. Passo 2. Roller coaster — utiliza — Railway track. Rails.
3. Passo 3. Railway track — inspirou — Time zones. Introduced because of railway timetables.
4. Passo 4. Time zones — utiliza — Electrical telegraph. Synchronizing time by telegraph.
5. Passo 5. Electrical telegraph — evoluiu de — Optical telegraph. The electrical telegraph replaced semaphore lines.

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