Here's an incredible lecture given by Dan Pink at RSA Animate and creatively animated by RSA which tells us that our larger motivations are not what we are led to expect in our normal cultural understanding. It explains why so many are motivated to work for free or even pay a high price to work toward "higher" goals and dreams.
from: http://www.youtube.com/watch?v=u6XAPnuFjJc
____ (Traduction anglais-français ci-dessous par Google Translate)