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The group Islamic State are rarely out of the news, so PM has been getting answers to all the questions you may have about the group. We鈥檝e been speaking to experts who have written about Islamic State. Emma Sky is the author of The Unraveling: High Hopes and Missed Opportunities in Iraq. Andrew Hosken is from Radio 4's The World Tonight and wrote: Empire of Fear: Inside the Islamic State. Charles Glass wrote Syria Burning: ISIS and the Death of Arab Spring. We wanted to know about Islamic State's greatest strength.