In 1883, Krakatoa exploded over Indonesia, unleashing the deadliest eruption in modern memory. A gallery of some of its most spectacular successors suggests that a similar disaster may lurk beneath ...

How loud can sound really get? The human ear can safely hear up to around 120 decibels. Beyond that, it starts to hurt. At 150 decibels, eardrums can rupture. But history has witnessed sounds far ...