From hands to feet, voice to vision, our digital tools extend, transform, and sometimes erase the human body. By Vanessa Chang The influential computer scientist Mark Weiser once wrote that “a good tool is an invisible tool. By invisible, I mean that the tool does not intrude on your consciousness; you focus on the task, not the tool.” By this definition, many of our digital tools seem to have succeeded completely; they liberate our bodies by becoming invisible to users. By c

Scientists are uncovering how the hidden effort of talking affects everything from everyday conversations to spotting deception and fake...