Cockpit and fitness tracker: what they have in common

1. Step 1. Cockpit — has part — Attitude indicator. An attitude indicator.
2. Step 2. Attitude indicator — has part — Gyroscope. A gyroscope.
3. Step 3. Gyroscope — is used in — Electric unicycle. Gyro sensors feel the lean, and the wheel rolls to keep the rider up.
4. Step 4. Electric unicycle — has part — Accelerometer. Tilt sensors.
5. Step 5. Accelerometer — is part of — Fitness tracker. A pedometer.

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