The answer to today's Geo Quiz is Moscow. The city is home to the Danilov Monastery - the headquarters of the Russian Orthodox church. The World's Elizabeth Ross reports that the historic bronze bells that have hung in a tower at Harvard University for nearly 80 years are ringing for the last time today at commencement. They'll be making their way back to their original home at the monastery.

The World's Marco Werman tells us about a music collaboration aimed at building a peaceful future for Angola. It's the creation of a Washington-based NGO called "Search for Common Ground."

We've got some new insight, maybe, into laziness. I wish I had the energy to care. Then, we take a look at how, and why, Vladimir Putin's enemies seem to be disappearing from small screens across Russia. Then, an in-depth look at whether or not animals are still an essential part of scientific testing. And we end with a report on some humble, yet lovable, plankton. Music this week by The Flying Burrito Brothers, and Plankton Man.

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Today on The World: The moral complexities of providing aid in countries run by military regimes; A new documentary explores life along China's Yangtze River... and the disruptions caused by the "Three Gorges Dam" project; and Egyptian-born actor Sayed Badreya talks about his role in Adam Sandler's new movie "You Don't Mess with the Zohan" and what it's like to play an Arab in Hollywood.

Zimbabwean opposition leader Morgan was detained again for the second time this week. And yesterday the government of President Robert Mugabe banned all NGOs from distributing food in the country. Anchor Marco Werman has the latest developments.

International humanitarian aid groups sometimes face moral dilemmas when they work in countries run by authoritarian regimes. Anchor Marco Werman speaks with Nicolas de Torrente, the head of Doctors Without Borders in the United States, about the challenges of operating in places like Zimbabwe and Myanmar.

The West Bank city of Jenin was once called the "cradle of suicide bombers." Israel has barred its citizens from going there for the past six years. But last week, Israel relaxed the restrictions for Arab Israeli citizens. Correspondent Matt Gutman reports from Jenin.

Senator Hillary Clinton is expected to concede to Senator Barack Obama tomorrow. We thought we'd listen to some other concession speeches from around the globe.

The World's Ken Bader tells us about a new documentary called "Up the Yangtze".

The US and Iraqi governments are negotiating a new security agreement for keeping US troops in the country. The issue is proving to be politically tricky one for Baghdad and for Washington, as The World's Matthew Bell reports.