Today on In Case You Missed It: A conductive-ink pen and matching sensor from Japan allows you to draw an instrument on any piece of paper. Carnegie Mellon scientists invented the Ballbot: A robot that moves and balances on a single spherical wheel. And we also wanted you to see the levitating lightbulb that floats above its base with magnetic levitation.via Engadget RSS Feedhttp://ift.tt/1PoJswN