Stimulated emission and screw press: what they have in common

1. Step 1. Stimulated emission — is used in — Laser. The working principle of the laser.
2. Step 2. Laser — includes — Laser diode. A semiconductor laser.
3. Step 3. Laser diode — is part of — Laser printer. A laser draws the image on the drum.
4. Step 4. Laser printer — is a kind of — Printer. A printer.
5. Step 5. Printer — works like — Gutenberg printing press. A printer is a personal printing press: it transfers an image onto paper.
6. Step 6. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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