This was originally posted at 1:00 p.m. EST on Tuesday, January 25. It has been updated multiple times. Some of the information near the top of the post may be outdated, and if you've been following the story closely, the information at the top will definitely seem very basic. So please click here for the most recent updates. You might also want to check out our explainers on what's happening in Libya and what's happening in Bahrain.
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The basics: Egypt is a large, mostly Arab, mostly Muslim country. At around 80 million people, it has the largest population in the Middle East and the third-largest in Africa. Most of Egypt is in North Africa, although the part of the country that borders Israel, the Sinai peninsula, is in Asia. Its other neighbors are Sudan (to the South), Libya (to the West), and Saudi Arabia (across the Gulf of Aqaba to the East). It has been was ruled by Hosni Mubarak since from 1981 until February 11.
Source: http://motherjones.com/mojo/2011/01/whats-happening-egypt-explained
Emilie de Ravin Tara Reed Avril Lavigne Bridget Moynahan Noureen DeWulf