The giant panda is listed as endangered in the World Conservation Union's (IUCN's) Red List of Threatened Species. There are about 1,600 left in the wild. More than 300 pandas live in zoos and breeding centers around the world, mostly in China.
The riverlands and the location of the Trident. The Trident is a major river in the riverlands of the Seven Kingdoms. Made of numerous smaller tributaries, it is one of the largest rivers on the continent of Westeros.
Correspondent Scott Pelley takes a rare look inside the deadliest weapon ever built. It's a voyage on the Trident nuclear ballistic missile submarine. It's a doomsday machine, built to strike back if the United States is ever reduced to ashes in a nuclear holocaust. The Tridents have been on patrol for about 20 years. But while they've been sailing under the sea, the world above has changed.