Thermal camera and railway track: what they have in common

1. Step 1. Thermal camera — is part of — Weather satellite. Infrared radiometers.
2. Step 2. Weather satellite — is used in — Weather forecast. Satellites.
3. Step 3. Weather forecast — uses — Electrical telegraph. Collecting reports by telegraph.
4. Step 4. Electrical telegraph — is used in — Time zones. Synchronizing time by telegraph.
5. Step 5. Time zones — was inspired by — Railway track. Introduced because of railway timetables.

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