WHAT is Ramadan? WHAT role might weather play in making this Ramadan particularly difficult? WHAT do Muslims avoid during this time? HOW do they use this time? HOW long does Ramadan last? WHY have thousands of Iraqi exiles left Syria in recent days? WHERE else, according to the article, is Ramadan "marked by uncertainties"? WHO is Mohamed Morsi? WHEN did Ramadan start in Iran, Iraq and many Shiite Muslim areas? WHEN did it start in much of the Sunni world? WHEN does the daily fasting begin? WHEN does it end? Related: Our collection of resources, World Religions.