Scientific method and truck: what they have in common

1. Step 1. Scientific method — uses — Telescope. Galileo: observation as a method.
2. Step 2. Telescope — is used in — Heliocentric system. Galileo’s confirmations.
3. Step 3. Heliocentric system — is used in — Orrery. The Copernican model.
4. Step 4. Orrery — has part — Gear. Gear trains.
5. Step 5. Gear — is part of — Differential. It consists of bevel gears.
6. Step 6. Differential — is part of — Truck. Differentials in the drive axles.

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