Mop e electrical telegraph: o que têm em comum

1. Passo 1. Mop — evoluiu de — Vassoura. A cleaning tool.
2. Passo 2. Vassoura — é feito de — Plant fibre. A broom is tied from twigs and grasses.
3. Passo 3. Plant fibre — é material para — Hygrometer. Humidity was shown by a fibre that changed length.
4. Passo 4. Hygrometer — faz parte de — Weather station. A hygrometer.
5. Passo 5. Weather station — é utilizado em — Weather forecast. Observations.
6. Passo 6. Weather forecast — utiliza — Electrical telegraph. Collecting reports by telegraph.

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