Crankshaft and smartphone: what they have in common

1. Step 1. Crankshaft — has part — Ball bearing. The main journals of the shaft are bearings (in combustion engines usually plain bearings).
2. Step 2. Ball bearing — is part of — Gyroscope. Legs.
3. Step 3. Gyroscope — is part of — Smartphone. A MEMS gyroscope detects the rotation of the phone.

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