A pair of MIT Media Lab alums have come up with a do-it-yourself kit for making smart environments. David Carr and John Kestner, partners in the industrial design firm Supermechanical, have developed a small, durable, inexpensive remote sensor node, and an easy-to-use web app that turns data from the sensor node into timely information. The system, dubbed Twine, lets you tie everyday objects into your digital life.