Is Russia working on a new weapon to be deployed in space, and how serious of a threat is it? Today's show brings you multiple perspectives on the issue. We're also remembering a doctor who once operated on his own appendix, and we're examining the possibility of surgery in space. An encore by two legendary figure skaters, the work of a "sound artist" in Qatar, and a surprising find in an English pond round out today's coverage!

Please note that we will be off the air on Monday, February 19 in observance of Presidents Day. We look forward to seeing you again next Tuesday!

This Friday's news quiz covers topics featured throughout the week on The World from A to Z:

1. Despite recent outbreaks of dengue fever, Carnival celebrations took place throughout the week in cities like Rio de Janeiro. In what nation is this city located?

2. In what capital city, whose metropolitan area is the world’s largest (with 37 million people), have engineers designed unique systems to help skyscrapers withstand earthquakes?

3. In what body of water would you find the island nation of Trinidad and Tobago, where a mysterious shipwreck recently spilled oil onto some beaches and a nearby reef?

4. The Cold War, a tense period that followed World War II, was a decades-long rivalry between what two main countries?

5. Ninety percent of the flowers that are imported into the United States pass through what city, where U.S. Customs and Border Protection agents scan them for pests and disease?

6. On February 14, 1849, U.S. President James K. Polk became the first sitting American leader to do what?

7. Name the U.S. Homeland Security secretary, who was impeached by the House of Representatives this week but is likely to be acquitted by the Senate.

8. What is the largest lake in the Americas, where the wreck of the SS Arlington was recently located but a mystery persists concerning the ship’s captain?

9. What nation has been accused by U.S. officials of developing an anti-satellite weapon, though the country ridiculed the suggestion?

10. Name the revolutionary who took over as the leader of Cuba on February 16, 1959, eventually enacting reforms that caused Cuba’s relationship with the U.S. to crumble?