The global population is expected to reach 7 billion Monday — just 12 years after hitting 6 billion — and the milestone has many pondering the complex challenges associated with billions more people on Earth in the coming years.

An Iranian actress who was sentenced to a year in jail and 90 lashes for appearing in a film critical of the country's government has been released, according to Amnesty International and the film's producers.

It's not often that the issue of polygamy makes it to the top of the political agenda. But in the past week it's become a litmus test for the course of the Arab spring, and part of the debate about the compatibility of Islam and democracy.