Laser printer and shaduf: what they have in common

1. Step 1. Laser printer — has part — Laser diode. A laser draws the image on the drum.
2. Step 2. Laser diode — is used in — Barcode. Barcode scanners use lasers.
3. Step 3. Barcode — is used in — Warehouse robot. Navigation by markers.
4. Step 4. Warehouse robot — evolved from — Forklift. Automating warehouses.
5. Step 5. Forklift — uses — Counterweight. A counterweight.
6. Step 6. Counterweight — is used in — Shaduf. The counterweight makes lifting the bucket easier.

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