Football and electronic calculator: what they have in common

1. Step 1. Football — has part — Inner tube. An inflatable bladder.
2. Step 2. Inner tube — uses — Compressed air. Air.
3. Step 3. Compressed air — is used in — Air brake. The brake is controlled by air pressure in the train pipe.
4. Step 4. Air brake — evolved into — Anti-lock braking system (ABS). Anti-skid systems first appeared in aviation and on railways.
5. Step 5. Anti-lock braking system (ABS) — has part — Microprocessor. A control unit.
6. Step 6. Microprocessor — evolved from — Electronic calculator. The Intel 4004 was designed for a Busicom calculator.

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