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Scientists descend to a fiery lava lake to protect a Congolese city in its path. By Michael Finkel Photograph by Carsten Peter "excerpt comes from the April issue of National Geographic magazine" (http://ngm.nationalgeographic.com/2011/04/nyiragongo-volcano/finkel-text) When? This is the question that has brought two of the world's leading volcano scientists to the center of Africa; it's the question that haunts a team of Congolese seismologists; it's the question that may determine the fate of close to one million people. When will Nyiragongo erupt? Nyiragongo is a two-mile-high volcano towering over the eastern edge of the Democratic Republic of the Congo (DRC)—one of the most active volcanoes on the planet and also one of the least studied. The chief reason for the lack of research is that for the past 20 years the eastern DRC has seen nearly constant warfare, including a spillover of the massacres in neighboring Rwanda. One of the largest United Nations forces...

The expedition team is "99.9 percent" sure. Others, well, aren't. compiled by Dr. Nitish Priyadarshi Near the top of Mount Ararat (seen from Armenia in a file photo) in Turkey, explorers claim to have found Noah's ark. Photograph by Martin Gray, National Geographic National Geographic News Published April 28, 2010 A team of evangelical Christian explorers claim they've found the remains of Noah's ark beneath snow and volcanic debris on Turkey 's Mount Ararat (map) . But some archaeologists and historians are taking the latest claim that Noah's ark has been found about as seriously as they have past ones—which is to say not very. Turkish and Chinese explorers from a group called Noah's Ark Ministries International made the latest discovery claim Monday in Hong Kong, where the group is based. "It's not 100 percent that it is Noah's ark, but we think it is 99.9 percent that this is it," Yeung Wing-cheung, a filmmaker accompanying t...