I also recommend the Ken Robinson talk(s).
Here are some more. I could list another few dozen but these will do. All are provocative, informative, insightful and stimulating.
(I was trying to find a great talk I?d seen in the last few months from a man who suffered depression and brilliantly, elegantly described the condition so well it gave me a new understanding and better ability to empathise. Couldn?t dig it up though.)
The first two below can completely change our view on the world (for the better). If they?re of interest, respective books by both speakers are available and highly recommended:
http://www.ted.com/talks/steven_pinker_on_the_myth_of_violence
?Steven Pinker charts the decline of violence from Biblical times to the present, and argues that, though it may seem illogical and even obscene, given Iraq and Darfur, we are living in the most peaceful time in our species' existence.?
http://www.ted.com/talks/peter_diamandis_abundance_is_our_future
?Onstage at TED2012, Peter Diamandis makes a case for optimism ? that we'll invent, innovate and create ways to solve the challenges that loom over us. "I?m not saying we don?t have our set of problems; we surely do. But ultimately, we knock them down.?
http://www.ted.com/talks/sam_harris_science_can_show_what_s_right
?Questions of good and evil, right and wrong are commonly thought unanswerable by science. But Sam Harris argues that science can ? and should ? be an authority on moral issues, shaping human values and setting out what constitutes a good life.?
http://www.ted.com/talks/vilayanur_ramachandran_on_your_mind
?Vilayanur Ramachandran tells us what brain damage can reveal about the connection between celebral tissue and the mind, using three startling delusions as examples.?
http://www.ted.com/talks/elon_musk_the_mind_behind_tesla_spacex_solarcity
?Entrepreneur Elon Musk is a man with many plans. The founder of PayPal, Tesla Motors and SpaceX sits down with TED curator Chris Anderson to share details about his visionary projects, which include a mass-marketed electric car, a solar energy leasing company and a fully reusable rocket?
http://www.ted.com/talks/craig_venter_unveils_synthetic_life
?Craig Venter and team make a historic announcement: they've created the first fully functioning, reproducing cell controlled by synthetic DNA. He explains how they did it and why the achievement marks the beginning of a new era for science.?