Over at TIME.com, we've published David Greelish's interview with Alan Kay, the famously quotable visionary whose Dynabook proposal has provided much of the inspiration for advances in mobile computing for over 40 years now. Kay talks about his work, laments that the computer has failed to live up to its potential as an educational tool, and says that the iPad betrays the vision that he and others created at Xerox PARC and elsewhere in the 1970s