Learn more about ISIS, the Islamic militant group that's taken over parts of Iraq and is advancing toward Baghdad.
With its multi-pronged assault across central and northern Iraq in recent weeks, the Islamic State in Iraq and Syria (ISIS) has usurped Al-Qaeda as the most powerful and effective extreme jihadist group in the world.
Summer means road trips, and it seems everyone has a tip on how to save fuel. But which are fact and which are fiction? Take this quiz to find out.