Leonard Susskind (famous string theory advocate at Stanford) teaches an interesting set of courses in physics in continuing education. I will be posting some of his lectures here. I will be posting his quantum mechanics lectures. The first lecture posted here is about 2 hours long. Susskind is a great communicator, so well worth watching-especially for those interested in self-study of quantum mechanics, relativity and string theory.
Yuri Milner and Papa Oumuamua: a telephone call
14 hours ago