In the desert near the Las Vegas airport stands a structure the size of 11 football fields. Security guards dressed in ninja style, all in black and with tasers strapped to their thighs, confiscate the identity cards of visitors, then lead them through a series of gates into the so-called SWITCH SuperNAP. Every part of the datacentre was custom-designed for optimal temperature control, with blue vents for cool air, red ones for warm, and everything looking futuristic. Computers, stacked neatly in cages, stretch out in long rows. They belong to the government, to eBay and Google, and to a growing number of other companies who could put their servers anywhere, but choose this spot in Nevada.