Two American journalists in detention in North Korea face trial there this week. Some North Korea watchers suggest that if Pyongyang decides to release the women that might be a sign North Korea may be ready to talk about its nuclear program.

Ahead of the 20th anniversary of the Tiananmen Square protests, one former student leader recounts a particular moment of the violence.

For today's Geo Quiz we were looking for the name of a city in Scotland where scientists and musicians have gotten together to recreate an ancient trumpet called the lituus. The answer is Edinburgh.

Anchor Marco Werman speaks with musician Kim Alves, a multi-instrumentalist from Cape Verde who combines island dance rhythms with fiery guitar technique.

Today on The World: President Obama begins his Middle East charm offensive; We have the latest from Saudi Arabia, and look ahead to Mr. Obama's speech in Cairo; Also -- on the eve of the anniversary of the Tiananmen massacre, we learn what China's people remember, and what their government would rather forget.

King Abdullah with President ObamaThe World's Jason Margolis reports on President Obama's day in Saudi Arabia.

The World's Aaron Schachter reports on the Saudi influence in Pakistan and Afghanistan. He says Pakistanis have been drawn to a Saudi style of Islam. But in Afghanistan, many blame Saudi Arabia for inspiring and supporting Afghanistan's fundamentalist Taliban.

Anchor Lisa Mullins speaks with The World's Religion Editor Jane Little about how President Obama must balance breadth and nuance in his speech in Cairo tomorrow to the Muslim and Arab world.

Anchor Lisa Mullins explains that President Obama isn't just making a speech tomorrow to the Muslim world. He's also sending out text messages about the speech -- in a host of languages, including English, Arabic, Urdu, and Persian.

Julia Kumari Drapkin reports from Panama on efforts to protect jaguars, the biggest cats in the all of the Americas. She profiles one group's work to find the corridors that jaguars use to move between protected areas.

For best results, please allow video to load completely before playing. Or click here to view on Vimeo, YouTube, or Blip.tv. Also, see photos and read the transcript. Produced by Julia Kumari Drapkin.