In the nineteenth century, people put their ears to a railroad track to get an early warning of an approaching train. why did this work?

The vibrations and sound waves from the train would travel up the railroad tracks ahead of the train. When a person put their ear on the track, it would receve the signals from the vibrations and sound waves.

john locke is most associated with the idea of consent of the governed which is the idea that the government is only valid if it has the consent of the people who are being governed.

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