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The militant group has threatened journalist Steven Sotloff with death because of the US airstrikes in Iraq
Phil Torres of TechKnow looks at the early warning systems that California scientists are working on
Aleppo rescuers known as the Civil Defense Force risk their lives to help victims of Bashar al Assad's barrel bombs
Douglas McAuthur McCain's death brings more fears over Americans being radicalized overseas
Karyne Levy, Senior West Coast Tech Editor for Business Insider, explains