Conspiracy theories used to be about the existence of Sasquatch, the Lock Ness Monster, or aliens! They were fun or funny, but now, not so much. Today, troubling conspiracy theories flourish like measles in a Marin County Montessori. How did the extreme go mainstream? We talk to Anna Merlan, who went above and beyond the call of duty, spending years of her life talking to conspiracy theorists from coast to coast while researching her new book, Republic of Lies - American Conspiracy Theorists and Their Surprising Rise to Power.