Laser diode and paper machine: what they have in common

1. Step 1. Laser diode — is used in — DVD. It is read by a red laser.
2. Step 2. DVD — evolved from — Video recorder. A replacement for video cassettes.
3. Step 3. Video recorder — has part — Magnetic tape. Video tape.
4. Step 4. Magnetic tape — is made of — Paper. Pfleumer’s first tape was paper coated with magnetic powder.
5. Step 5. Paper — uses — Paper machine. Industrial production.

Open Evothings