In “The Volcano Next Door,” from the April issue of National Geographic magazine, writer Michael Finkel takes readers on a journey of 1800°F temperatures, killer gases, and fiery eruptions. The article follows scientists as they descend to the scorching lava lake of Nyiragongo, a two-mile-high volcano that has the potential to destroy the nearly one million people that live at its base near the eastern edge of the Democratic Republic on the Congo.