Here is a site that is full of thought provoking, funny, intriguing and beautiful talks (videos), most are under thirty min. - www.ted.com -
I randomly select a talk every morning as a brain exercise (I am recovering from a head injury, TBI) just to get the nurons firing, and want to share TED with others that enjoy thinking. A fun talk to start with is one by the artists Theo Jansen.
Hope you enjoy this as much as I have.
Have a Dream!
Glen