Egypt's President Hosni Mubarak will not go to the 15th African Union summit in Uganda scheduled to open this Sunday despite officials earlier citing his planned attendance as proof of his good health, the state media reported Saturday. Mubarak delegated Prime Minister Ahmed Nazif to represent Egypt at the summit in Kampala, which is expected to address the sensitive issue of sharing Nile river water, the official Al-Ahram daily reported. Here are some facts about African Union. __