Zero and aeroplane: what they have in common

1. Step 1. Zero — is a kind of — Hindu–Arabic numerals. Part of positional notation.
2. Step 2. Hindu–Arabic numerals — evolved into — Binary number system. A positional system with base 2.
3. Step 3. Binary number system — is used in — Microprocessor. It works with binary numbers.
4. Step 4. Microprocessor — is part of — Engine control unit. A microprocessor.
5. Step 5. Engine control unit — is part of — Internal combustion engine. An engine control unit.
6. Step 6. Internal combustion engine — is part of — Aeroplane. Piston aero engines.

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