They can stay out of the line of fire. Scientists have long puzzled over the challenge of peering into active volcanoes to better plan for when they’ll blow. Now they can rely on drones to do the job for them. Recent flights over Guatemala’s Volcán de Fuego, for instance, revealed the makings of a cyclical eruption days in advance. Scientists hope more consistent surveillance of the volcano could help predict its more extreme explosions — a warning that could be a lifesaver for the 100,000 people who live nearby.