You need to read more or watch educational shows like PBS or NPR.

There is lots of enlightening work in the media on politics, culture, music, literature, science, education, and religion.  You should cultivate tastes based on the kinds of media you choose to let into your system.  And pay attention to what you are taking in, try to be an active instead of a passive listener to the media you consume.  In a lot of ways it determines who you are.  Even with comedy you can learn things from the Daily Show on Comedy Central or statistics on your favorite baseball players from watching ESPN.  No one said you have to be boring or a geek to be smart.