Gas turbine and smartphone: what they have in common

1. Step 1. Gas turbine — has part — Compressor. A compressor.
2. Step 2. Compressor — is part of — Air brake. A compressor pumps the air.
3. Step 3. Air brake — evolved into — Anti-lock braking system (ABS). Anti-skid systems first appeared in aviation and on railways.
4. Step 4. Anti-lock braking system (ABS) — has part — Hall sensor. Sensors measure the wheel speed.
5. Step 5. Hall sensor — is part of — Smartphone. A magnetometer compass.

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