The continuing rapid evolution and proliferation of different kinds of computer hardware, modes of digital encoding, operating systems and general or specialized software has ensured that digital obsolescence will be an equally ongoing problem. Cornell University Library’s digital preservation tutorial (now hosted by MIT Libraries) has a timeline of obsolete media formats, called the "Chamber of Horrors", that shows how rapidly new technologies are created and cast aside. A prime example of this problem is the BBC Domesday Project from the 1980s, although its data was eventually recovered with significant effort.