[url=http://www.ted.com/talks]1400+ talks[/url]. They can be highly educational and inspirational, but as talks range from ~5-20 minutes, you are looking at well over 250 hours of content. Let's make that a little more manageable. If you have any talks that you passionately feel are ideas worth spreading please post them (giving a little explanation as to why would also be nice).
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It's multiple TED talks, but what this guy (melodysheep) does with them (and other TED talks, as well as various sources) is amazing. The "Ode to the Brain" is what leapt to mind first (pardon the pun). If I had to pick one? I really appreciate what Sarah Silverman did. It was light hearted, silly, and yet even thoughtful and thought-encouraging.