Dental filling and personal computer: what they have in common

1. Step 1. Dental filling — uses — Ultraviolet. Light curing.
2. Step 2. Ultraviolet — is used in — UV/LED nail lamp. Ultraviolet light starts polymerisation: liquid gel polish hardens in a minute.
3. Step 3. 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.
4. Step 4. LED — is part of — Computer mouse. An optical mouse.
5. Step 5. Computer mouse — is part of — Personal computer. A mouse.

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