For decades, experts believed they knew what caused the Hindenburg disaster: that leaking hydrogen ignited--causing the airship to burst into flames. But there may be more to this story. Whatever triggered the explosion, it didn't just spell doom for the Hindenburg but for the entire rigid airship industry. What caused the Hindenburg Disaster?

The Titanic's tragic story captures the imagination of the public and experts of all kinds, who--decades after the ship's demise--still seek answers. Can new evidence reveal more about how--and why--the Titanic sank?