A pen that can use any liquid as ink - such as wine and juice - has been revealed. Called the Winkpen, the reusable device can suck up liquids and write on paper without the need for regular ink. It ...

Patents for ballpoint pens go back to the late 1800s, but it took half a century to develop good, fast-drying inks. Bic, Pilot, and other makers jealously guard their formulas, but to get that classic ...