UV/LED nail lamp and screw press: what they have in common

1. Step 1. UV/LED nail lamp — has part — LED. Modern lamps get their light from ultraviolet LEDs: the same semiconductor diodes as in a traffic light, just at a different wavelength.
2. Step 2. LED — is part of — Remote control. An infrared LED.
3. Step 3. Remote control — has part — Microcontroller. A microcontroller sends the codes.
4. Step 4. Microcontroller — is part of — Printer. A controller processes the print job.
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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