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 ...

In this video, I explore creating a doodle using a glow-in-the-dark ink pen under UV light. The lines appear invisible until the light reveals them, making for a fun and experimental drawing session.