Frequently asked questions
Is it free?
Yes. All lectures are free on their original sites, and this index is free too.
Do I need an account?
No. There are no accounts, no sign-ups and no tracking.
Do you host the videos?
No. The “Watch” button takes you to the original recording.
Can I get a certificate?
No. These are open course materials, not enrolled courses.
Can you add a course?
We add courses that have complete recordings and an open license. Suggestions are welcome — see Contact.
Why are some lectures from years ago?
Fundamentals do not age quickly. Many of the best-known lecture series were recorded ten or more years ago and are still widely used.