added more links to internal pages and a few other edits
fixed "learn more or help out or learn more" :P
minor format change
added a little bit just to connect with the psychology thing, thus we have links to all the internal about pages
I also like the flow better here, though we'll probably find room for improvement later
a few minor wording changes
a couple more minor word changes
added little bit under crowdfunding section emphasizing it as functioning because it at least address the dilemmas
(whereas gittip etc. do nothing to solve the problems)
Merge of homepage updates from Aaron