Newton’s laws and electrical telegraph: what they have in common

1. Step 1. Newton’s laws — is used in — Truss. A triangle is a rigid shape.
2. Step 2. Truss — is part of — Truss bridge. Trusses.
3. Step 3. Truss bridge — uses — Railway track. Railway bridges.
4. Step 4. Railway track — inspired — Time zones. Introduced because of railway timetables.
5. Step 5. Time zones — uses — Electrical telegraph. Synchronizing time by telegraph.

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