Ice skates and smartphone: what they have in common

1. Step 1. Ice skates — evolved into — Roller skates. Skates for dry land.
2. Step 2. Roller skates — has part — Ball bearing. Bearings.
3. Step 3. Ball bearing — is part of — Gyroscope. Legs.
4. Step 4. Gyroscope — is part of — Smartphone. A MEMS gyroscope detects the rotation of the phone.

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