Panama Canal and gyroscope: what they have in common

1. Step 1. Panama Canal — has part — Electric locomotive. Electric “mules” tow the ships through the locks.
2. Step 2. Electric locomotive — has part — Bogie. Bogies.
3. Step 3. Bogie — has part — Ball bearing. Axle boxes with roller bearings.
4. Step 4. Ball bearing — is part of — Gyroscope. Legs.

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