The eye of Hurricane Earl in the Atlantic Ocean, seen from a NASA research aircraft on Aug. 30, 2010. This flight through the eyewall caught Earl just as it was intensifying from a Category 2 to a Category 4 hurricane. Researchers collected air samples on this flight from about 30,000 feet over both land and sea and close to 100 different species of bacteria.
Terry Lathem, a graduate student in Georgia Tech's School of Earth and Atmospheric Sciences, takes notes aboard a NASA DC-8 aircraft gathering samples of microorganisms in the atmosphere.
Microbes are known to be able to thrive in extreme environments, from inside fiery volcanoes to down on the bottom of the ocean. Now scientists have found a surprising number of them living in storm clouds tens of thousands of feet above the Earth. And those airborne microbes could play a role in global climate.
A demonstrator shouts anti-government slogans as he stands in front of the Justice Ministry in the Tunisian capital, Tunis, on Nov. 6, 2012, as part of a demonstration by radical Salafi Muslims protesting against the imprisonment of hundreds of Salafist militants.
The uprisings of the Arab Spring unleashed a new political force in the region — Salafis, ultraconservative Muslims who aspire to a society ruled entirely by a rigid form of Islamic law. Their models are the salaf, or ancestors, referring to the earliest Muslims who lived during the lifetime of the Prophet Muhammad.
The use of security cameras such as these, looking out over Tiananmen Square in Beijing, is on the rise in China. Critics say the government is using them to discourage dissidents.
Credit Frank Langfitt / NPR
Li Tiantian, a human rights lawyer, is under heavy surveillance by Chinese authorities. She says police tried to get her boyfriend to break up with her by showing him photos of other men she had been involved with.