Author Dina Nayeri was young when she found out that there's a stark difference between credibility and belief – and it's a disconnect at the center of her new book, Who Gets Believed?: When the Truth Isn't Enough. Nayeri's family came to the U.S. as refugees from Iran in 1979. As she tells NPR's Juana Summers, that asylum process showed her how subjective belief can be – and she explains why, for her, the meaning of believing continued to shift, through faith and vulnerability, even as she was writing the book.