Astronomers measure the mass of the Milky Way by calculating how hard it is to escape The Manta Ray: How America's Futuristic Underwater Drone will Change Warfare.

There’s nothing quite like using the best fountain pens to get your writing done. The whole experience is rewarding, from purchasing one and unpacking it, to using it for the first time.

Fortunately, the range of pens available for trying out all sorts of writing projects, including calligraphy, has exploded. Take felt tip pens and markers, for example. This is a pen that’s known for ...