Fluoride and gyroscope: what they have in common

1. Step 1. Fluoride — uses — Chemical reaction. It strengthens enamel.
2. Step 2. Chemical reaction — is used in — Airbag. The gas comes from an instant reaction of sodium azide.
3. Step 3. Airbag — has part — Accelerometer. The crash sensor is an accelerometer.
4. Step 4. Accelerometer — is part of — Electric unicycle. Tilt sensors.
5. Step 5. Electric unicycle — uses — Gyroscope. Gyro sensors feel the lean, and the wheel rolls to keep the rider up.

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