If you watch only three videos in your life... PLEASE Let them be these:
http://www.ted.com/talks/viktor_frankl_youth_in_search_of_meaning.html
http://www.ted.com/talks/richard_wilkinson.html
http://www.youtube.com/storyofstuffproject#p/u/22/9GorqroigqM
http://youtu.be/Sqwd_u6HkMo