youtube version (1995, 44 mins), from Hamming's <i>Learning to Learn</i> course<p><a href="https://www.youtube.com/watch?v=a1zDuOPkMSw" rel="nofollow">https://www.youtube.com/watch?v=a1zDuOPkMSw</a><p>(The original linked text has a good Q&A session, worth reading.)