Impatient molecular biologists who need to know – now! – if their gels are done, have a new, pen-sized ally. Rather than carrying their gel trays to the dark room, they can whip out the diminutive UV ...

If you worked with computers back in the 1970s, there’s a good chance you used a light pen at some point: a simple input device that you’d point at the CRT screen to highlight text, choose menu ...