Did you ever snap a picture of that complex diagram you drew on your office white board so you can make space to draw another? Just a year ago, even that solution was pretty high-tech. Snap...

It’s your worst nightmare: squiggly lines all over your wall in neon greens, yellows, and reds. Paint stains on your brand new carpet. Handprints and smudges that seem to forever reappear on your white countertops. Sounds...