In 1963, Richard Feynman was invited to give the 1964 Messenger Lectures at Cornell University. These lectures were a tradition since 1924 and were aimed at improving the moral standard of society. Feynman, a renowned physicist, had previously worked at Cornell and had recently gained wider recognition through his book, The Feynman Lectures on Physics. Instead of the usual three lectures, Feynman chose to give a series of six lectures for a general audience, titled The Character of Physical Law. These lectures were recorded by the BBC and published in a book. In 2009, Bill Gates used the lectures in his Silverlight demo, “Project Tuva,” making them available for free online viewing with special features. Although the Silverlight framework was not widely adopted, Gates has since renewed the license to continue showing the videos on The Feynman Lectures Website. The lectures can be viewed using The Feynman Messenger Lectures Video Viewer, an application that offers high-definition video and a searchable transcript.
https://www.feynmanlectures.caltech.edu/messenger.html