Boomerang wings and smartphone: what they have in common

1. Step 1. Boomerang wings — is part of — Boomerang. Two wings with an aerofoil profile.
2. Step 2. Boomerang — uses — Angular momentum. Gyroscopic precession brings the boomerang back.
3. Step 3. Angular momentum — is used in — Gyroscope. The rotor keeps the direction of its axis.
4. Step 4. Gyroscope — is part of — Smartphone. A MEMS gyroscope detects the rotation of the phone.

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