diplomacy

President Obama departs Tuesday for Saudi Arabia, where he'll meet with King Salman and leaders of neighboring states. There's plenty to talk about: Relations have been strained on a number of fronts.

The corporation has U.S. approval, and ships could head for Cuba beginning in May 2016. But travelers can't be just tourists. They have to fit into one of 12 government-established categories.

A sculptor and a geologist are melting hundreds of pounds of rock in a giant cauldron to create realistic lava flows. Cool! NPR reporter Adam Cole pays a visit to learn more about lava's allure.

It's a nightmarish job: No exercise or fresh air and little food and sleep for days at a time, all in an effort to persuade 200 countries to save Earth's climate and the planet. Can they do it?