Hoverboard and internal combustion engine: what they have in common

1. Step 1. Hoverboard — evolved from — Segway. A simplified Segway without handlebars.
2. Step 2. Segway — uses — Feedback control. Balancing.
3. Step 3. Feedback control — is used in — Engine control unit. Control based on sensors.
4. Step 4. Engine control unit — is part of — Internal combustion engine. An engine control unit.

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