Richard Turere's TED talk: My invention that made peace with lions is a TED talk that highlights the beauty of invention and the possibility that there may always be a solution - you just have to not give up after the first failure. I love a new invention that gracefully solves an old painful problem.  

This short (under eight minutes) video of Richards wonderful light invention exemplifies a number of agile and leave principles. I love his low-fi design of the solution, his entrepreneurial spirit to not give up even though a number of failures were literally fatal for his stock.

And of course to never stop dreaming and improving because possibilities can be turned into probabilities.

The video is available from TED talks and Richard's profile is also available at http://www.ted.com/speakers/richard_turere.html