Topics can cover everything from anthropology to zoology. And there are a number of gems for advertising folk. Without trying hard, I found four interesting "Ted Talks," presentations that last 20 minutes or less. How about Malcolm Gladwell (author of Blink and The Tipping Point) discussing how one man's ideas about spaghetti sauce changed how food industry consumer research is done. Or Alisa Miller breaking down news coverage in the United States, and discovering, that even though we have more access to news from around the world than ever, we may actually be getting much less coverage of issues that concern us.
If you're interested in ideas and how the mind works, brain scientist Jill Bolte Taylor shares her experience of living through a stroke--and how the event allowed her to better understand the ways the two cortices of your brain act independently of each other. And if you are trying to understand other cultures and language, National Geographic's Wade Davis talks about all the languages and cultures around the world that are dying out, and why we may be losing some very important gifts of diversity.
There's lots more. And a few minutes of exploring the site may help spark some new creativity and ways of thinking for your own business/life/spirit.