Add Yahoo as a preferred source to see more of our stories on Google. Way back in the early 1990s, Adobe released the Portable Document Format (PDF). Ever since, PDFs have been a key tool in getting ...

Would researchers scrawl notes, critiques and comments across online research papers if software made the annotation easy for them? Dan Whaley, founder of the non-profit organization Hypothes.is, ...

Is a street preacher the right metaphor for every little blog online? UPDATE: Since this story was published, both Genius and Hypothesis have moved to undermine abuse via web annotation using their ...