[applause] >> i want to thank professor sunstein, yes, mr. power, for a very interesting and eluminating presentation. you've argued in #republic that things have gotten worse in this respect in the last 20 years, the technology, facebook, social media have exacerbated what you portray as a problem of people being unduly negative and polarizing and being isolated in silos and hostile silos, if you will. you offer some solutions in the book. but what if there's a nudge to which people don't budge to use the phrase, you don't have the government regulation of the internet. can you give the listeners an idea of what solutions and how hopeful you are, you know, you say at one point people should be polite to each other, that's a lot of garbage. [laughter] >> okay, so there's a great psychologist in the university who would have won the nobel prize had he not died young who said he's an optimist because it's irrational pessimistic because if your a pessimistic you suffer, first about the sad and then second when it happens. in terms of solutions,

now we kick off the weekend can cass sunstein in his book #republic, divided democracy in the age of social