The content and structure of knowledge are at all times fundamentally moulded by the media through which knowledge is communicated. Today, the internet and mobile telephony are essential parts of these media. Minds have become bound up with technological devices. Face-to-face communication on the one hand, and the solitary study of documents on the other, merge with a world of continuous digital networking, texts with a world of images. Education is confronted by radical challenges; a revolution in epistemology is underway. The volume contains papers by, among others, Ian Hacking, Andrew Brook, Richard Coyne, Maurizio Ferraris, James Katz, and Mike Sharples.