TED is a non-profit organization arranging conferences where the top experts of various fields give short, 10 to 20 minute talks on all kinds of topics. TED is short for "technology, entertainment and design", but the scope has expanded vastly since the original conference back in 1984. I have been watching the TED talks with my smartphone using the TED Air app, but they are viewable at the TED website as well.
If you now got even slightly interested I recommend starting with a short talk and a familiar topic. I'll make it really easy for you and post a suitable video right here. The talk is called Doodlers, unite! and it's just six minutes long:
Now, I haven't watched that many talks yet but they have all been very fascinating. Jill Bolte Taylor's stroke of insight, for example, is, as far as I understand, regarded as one of the best TED talks ever. I'm tempted to give more suggestions on what to watch but as I haven't watched even ten talks myself I'll just give you a link to the most viewed TED talks which should be a good starting point for finding some interesting ideas worth spreading.