Quantum dots and shipping container: what they have in common

1. Step 1. Quantum dots — is a kind of — Semiconductor. Quantum dots are tiny semiconductor crystals that glow in pure colours.
2. Step 2. Semiconductor — is material for — Hall sensor. The sensor is a semiconductor plate.
3. Step 3. Hall sensor — is part of — Anti-lock braking system (ABS). Sensors measure the wheel speed.
4. Step 4. Anti-lock braking system (ABS) — evolved from — Air brake. Anti-skid systems first appeared in aviation and on railways.
5. Step 5. Air brake — is part of — Truck. Air brakes, as on trains.
6. Step 6. Truck — uses — Shipping container. A container moves from ship to truck without being unloaded.

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