Brooke Gladstone is the host of On the Media.

“I’ve learned so much about how easy it is to redefine reality in this era of billions of filter bubbles. How easy it is to cast doubt on what is undeniably true. And I think that that’s what frightens me the most. I actually think that’s what frightens most people the most. How do we make sure that we all live in the same world? Or do we?”

Thanks to MailChimp, Texture, and School of the Art Institute of Chicago for sponsoring this week's episode.