If you were shipping, say... a cargo container of pineapples from Hawaii to Poland, you would probably want to know what was happening to those pineapples along the way. For instance, were they allowed to get too hot or too cold? Did they clear customs? Did they follow the planned route? Using wireless radio frequency identification sensors recently developed at Spain’s Public University of Navarre (UPNA ), you could know all these things and more, in real time.