Today on The World: Cairo's reaction to President Obama's speech to the Muslim world; Iran's reaction to last night's presidential debate in Tehran; Journalist John Hockenberry recalls the events surrounding the death and funeral of Ayatollah Khomeini 20 years ago in Tehran.

Anchor Marco Werman examines the cultural and musical connections between Brazil and France. As people in both nations mourn the victims of Monday's crash of an Air France jet in the Atlantic, we hear from the operator of a club in Paris, Favela Chic, that's home to Brazilians and French.

For today's Geo Quiz, we asked you to name a former Soviet Republic that's now making some changes to its map. Name changes, that is. The answer is Ukraine. Anchor Lisa Mullins speaks with Rostoslav Khotin, editor of the BBC's Ukrainian service.

Our geography puzzler.

The World's Mary Kay Magistad reports from Beijing on the eve of the 20th anniversary of the Tiananmen massacre. Many Chinese remember the event vividly, but it's a day the Chinese government would rather forget.

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.

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.

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.

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.

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