Before you invest three hours to watch these lectures you should know that the title is terribly misleading. These lectures are not about QM at all, they are about the history of QM, albeit told by someone who was actually part of it. But the coolness of hearing the history of QM firsthand is undermined by the fact that Bethe is clearly well past his prime, and he's not particularly good at telling stories.<p>If you want a video that is true to this title I'd recommend this:<p><a href="http://www.youtube.com/watch?v=2rqd8Oa-sA4" rel="nofollow">http://www.youtube.com/watch?v=2rqd8Oa-sA4</a><p>EDIT: And if you want to <i>really</i> understand QM, there's this:<p><a href="http://www.youtube.com/watch?v=dEaecUuEqfc" rel="nofollow">http://www.youtube.com/watch?v=dEaecUuEqfc</a><p>:-)
Not quantum physics, but if you want to read a real classic, there's also Weyl's <i>Space-Time-Matter</i>, which is mind-blowing in its lucidity and ambition (unifying GR and electromagnetism): <a href="http://archive.org/details/spacetimematter00weyluoft" rel="nofollow">http://archive.org/details/spacetimematter00weyluoft</a>.<p>Well, while I started, why not add a list of freely available physics books online from PSE: <a href="http://physics.stackexchange.com/questions/6157/list-of-freely-available-physics-books/7382#7382" rel="nofollow">http://physics.stackexchange.com/questions/6157/list-of-free...</a>.<p>It's amazing that you can pretty much get up to PhD level education using these books (you should buy Landau's books, though, unfortunately those are not free).
If you're interested in watching Physics lectures online, don't miss Susskind's excellent series of lectures from Stanford.<p><a href="http://www.lecture-notes.co.uk/susskind/" rel="nofollow">http://www.lecture-notes.co.uk/susskind/</a>
If you really want to have a good (but easy) introduction to quantum mechanics (and quantum information) I recommend <a href="http://www.amazon.com/Six-Quantum-Pieces-Course-Physics/dp/9814327549" rel="nofollow">http://www.amazon.com/Six-Quantum-Pieces-Course-Physics/dp/9...</a> - it requires nothing more than some linear algebra.<p>(As a side note, I'm trying to make a computer game of quantum mechanics, to make people learn by playing.)
Quantum tic-tac-toe is an engaging way to get a feel for superpositions and cyclic entanglements. <a href="http://en.wikipedia.org/wiki/Quantum_tic-tac-toe" rel="nofollow">http://en.wikipedia.org/wiki/Quantum_tic-tac-toe</a>