New York Times reporter Rukmini Callimachi is known for her in-depth reporting on terrorism and the Islamic State. Her recent jailhouse interview with Harry Sarfo, a German citizen who joined ISIS and trained in Syria before disavowing the group, revealed the organization's particular interest in recruits from Europe. "[Harry] was very much a desirable target for them, given his German passport and his experience living in London — two countries that they're still trying to infiltrate," Callimachi tells Fresh Air's Terry Gross.

In addition to her on-the-ground reporting, Callimachi follows ISIS' encrypted social media channels and communicates through social media with people connected to the terror group. She says that the group's recruiting efforts are widespread and focus on both the "mentally unwell" and those who have been "radicalized since birth."

Callimachi says the individual motivations of the recruits don't really matter as long as they contribute to the Islamic State's primary objective. "The purpose of this group is to spread terror, to spread it all over the world, to make the kaffir, the infidel — which is us — feel as if they're not safe anywhere," she says. "That's their end goal."

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San Diego Comic-Con is over. Nerds from all around the world have packed up their costumes, wiped off their makeup and left the city. Many of them will bring home more than just collectibles and photos. They'll also bring back memories of meeting their favorite artists and writers.

Marjorie Liu is one of those writers; she wrote the epic fantasy comic book Monstress with Japanese artist, Sana Takeda. Throughout the weekend, fans flocked to their booth to meet Liu and have her sign their copies of the book.

"Thank you guys so much for making this book," 26-year-old Jessica Wooden said as she approached the table, "It's eye-opening," she laughed, "and it's just great." Liu looked up and smiled. "That means the world to us. Thank you so much," she said, handing the book back to Wooden.

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