Vilayanur Ramachandran has a truly outstanding, enjoyable, and insightful TEDTalk, A journey to the center of your mind. Not only should you watch it for the content, pay attention also to the form — he is a master expositor. Besides, it contains one of the most convincing debunkings of Freudian bull ever (his first example).
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(Fret not about having to decipher a strong Indian accent. Aside from strong r’s, he’s extremely understandable and rather pleasant.)