Memories of the Tahrir Square protests will be re-ignited in Egypt today as its former president Hosni Mubarak faces trial in Cairo, along with his two sons and others from his regime.

The BBC's world affairs editor John Simpson reflects on why the Arab Spring "is taking an awful long time" and "does not really look like a success".

And Mustapha Kamel Al-Sayyid, political science professor in Cairo, explains why "adjustment" to the election timetable is typical of a "transitional period".

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