This is a rare gem: Four lectures on quantum mechanics by Paul Dirac… on YouTube! Here’s the first one.
Also, the Q+ online lecture series continues to go strong, bringing in a steady stream of high-quality speakers. This month constitutes the “Nobel lecture”, and will be given by Dietrich Leibfried of NIST Boulder, in lieu of Dave Wineland, on April 23rd at 5pm UK time. The title is “Towards scalable quantum information processing and quantum simulation with trapped ions”, and it’s sure to be a great talk. Though the number of live video streams will be limited, you can go to the Q+ website to reserve a spot, or wait until after the lecture and watch a recording.