[David Prutchi] has just shared his incredible work on making his own shortwave ultraviolet viewers for ... seeing the truly invisible. The project has not only fascinating application examples, ...

Maleden Invisible Ink Pens. These top-sellers are super popular among Yahoo readers this year, and for good reason. Creating cryptic messages is loads of fun for both kids and the — ahem — young at ...

An invisible band of radiation with wavelengths from 400 to 10 nm, ultraviolet (UV) light starts at the end of visible light and ends at the beginning of X-rays. The primary source of ultraviolet ...