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Nowadays, an increasing number of sensors are becoming embedded in the everyday objects or in the environment at a low cost. Accordingly, our living environments are populated by an increasing number of artefacts, i.e., objects enhanced with sensing, computation and networking abilities. In addition, people are increasingly using mobile devices as intermediaries between themselves and the artefacts. As a result of this continuing trend, an elementary Ambient Intelligence (AmI) infrastructure has become installed, though still fragmented, information appliances are commercially available, and Ubiquitous Computing (UbiComp) applications are being deployed. This paper discusses the course of UbiComp evolution since its inception and the inevitable criticality of interdisciplinary approaches in UbiComp. We conclude by highlighting the impact of UbiComp introduction in society and future opportunities that may rise in this exciting field of science.