Interconnected technology is now an inescapable reality – ordering our groceries, monitoring our cities and sucking up vast amounts of data along the way. The promise is that it will benefit us all – but how can it? By Adam GreenfieldIn San Francisco, a young engineer hopes to “optimise” his life through sensors that track his heart rate, respiration and sleep cycle. In Copenhagen, a bus running two minutes behind schedule transmits its location and passenger count to the municipal traffic signal network, which extends the time of the green light at each of the next three intersections long enough for its driver to make up some time. In Davao City in the Philippines, an unsecured webcam overlooks the storeroom of a fast food stand, allowing anyone to peer in on all its comings and goings