Why do I have to register?
Registration on this site is free and open to everyone, and you can navigate most of the site anyway.
Registering you gain access to the lectures archive, you can contribute to the site directly, and you can participate in our mailing list.
Since your email address is both your login username and your mailing list subscription, when registering make sure you provide a valid one, or you will not receive the mailing list, nor you'll be able to retrieve your password in case you lose it.