The World Health Organization says the Syrian civil war is currently the worst ongoing humanitarian crisis on earth.
Aid groups have been scrambling to provide shelter, food, water and health care to the huge numbers of people who've been uprooted by the fighting. The big question now is whether U.S. military action could spark another wave of refugees and make the situation worse.
Thousands of messages posted on the Internet every day in China get censored. Until now, little has been known about how the Chinese censorship machine works — except that it is comprehensive.
"It probably is the largest effort ever to selectively censor human expression," says Harvard University social scientist Gary King. "They don't censor everything. There are millions of Chinese [who] talk about millions of things. But the effort to prune the Internet of certain kinds of information is unprecedented."
It's 8 a.m. on a recent day at Forward Operating Base Nolay, a small Marine outpost in Taliban-infested Sangin District of southern Afghanistan's Helmand province. The Marines are in the process of caffeinating and preparing for the day.
Suddenly, explosions and gunfire ring out. The Marines don't run for their weapons or bunkers for that matter. They don't even flinch.
"We can sit here and we can have a cup of coffee when there's booms going on, we're not concerned about it," says Lt. Col. Jonathan Loney.