SANTA BARBARA, CALIF. — “Virtual sticky notes” — better known as “virtual graffiti’ — are messages associated with a physical space. It’s a great idea, and one whose time has come. Here’s why you’re ...

The rapid convergence of social networks, mobile phones and global positioning technology has given Duke University engineers the ability to create something they call "virtual sticky notes," ...

E-readers and tablets have us doing more of our reading on screens than ever before. The latter category, including devices such as the iPad Pro and Surface Pro, even offers pens for scribbling notes.

Engineers at Duke University have come up with a system for one day exploiting cell phones worldwide so that mobile users can easily learn from each other about everything from art exhibits to traffic ...