Claim: Not only CS50 lectures are recorded and uploaded to several services including iTunes U, EdX, and YouTube, but additional video "walkthroughs" are also recorded with professors and volunteer students; as well as, course questions which are available in both PDF and HTML format..
Evidence: CS50 lectures are recorded and uploaded to several services including iTunes U, EdX, and YouTube. Additional video "walkthroughs" are recorded with professors and volunteer students. Course questions, called problem sets, or "psets" for short, are available in both PDF and HTML format.