It's early in the morning on a sunny mid-January day and Khensani primary school is buzzing once again. Cheers and laughter fill the schoolyard as groups of arriving pupils line up in rows under a big red kiosk. After a long summer break, it's back to school time -- and rules need repeating.

They say there are no stupid questions -- or are there?

At least three police officers were injured in twin blasts in Cairo Friday, Egyptian state media reported.