The successes during her trip expand the president's vision for a multipolar world.
A series of short texts portrays the city of Johannesburg through the eyes of a fiction writer and resident.
The president used his first African visit – to the democratic bastion of Ghana – to signal a harder-line US approach to dealing with corrupt African leaders.
Girls in Uganda learn how to teach others to realize their visions, create jobs and wealth in rural areas.
Leaders agreed that warming must be stopped, but few specifics were reached on how to reduce greenhouse-gas emissions.
The system allows real-time tracking of even small birds up to five miles away.
The nations meeting in earthquake-devastated L'Aquila are also likely to consider what actions to take on Iran, North Korea.