I listen to a lot of the talks at TED. Would love to attend a conference. They speak on many subjects that are very interesting. This was one on prosthetic arms for our military.
http://www.ted.com/talks/dean_kamen_the_emotion_behind_invention.html?utm_source=newsletter_weekly_2010-04-06
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TED= Technology,Entertainment.Design
There's all kinds of things at the TED talks. They change all the time. If you google them and go to their website you can see the different things they're talking about now. Then in a week or month, it changes. I like that they have the top minds in the country interested in it and giving talks at them.
Smiley Guru
I've seen so many cool talks from TED. Fascinating topics and really well put together. I'd go to one of their conferences.