With two dates announced for upcoming face-offs between U.S. President Joe Biden and former U.S. President Donald Trump, we're remembering some previous debates of American political candidates. Other topics this Friday include a meeting between the leaders of China and Russia, conservation efforts in Thailand, the first person to sail around the world alone, and a wedding's uninvited "guesssst."

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

1. A trade group says more needs to be done to warn about the potential dangers of what sleep supplement, following thousands of emergency room visits by children who took it?

2. A massive solar flare allowed people as far south as Arizona, Georgia and Louisiana to see what atmospheric phenomenon, which is typically only visible much farther north?

3. On Sunday, 101-year-old U.S. Army veteran Jack Hausman received the French Legion of Honor for his service in what conflict?

4. In what impoverished, war-torn nation are Taliban rulers asking for international assistance to recover from extensive flash flooding that claimed hundreds of lives?

5. In what country, whose “wildfire season” typically runs between April and October, did dozens of fires recently prompt thousands of evacuations in a western province?

6. What snake, which is native to Australia, has the most toxic venom – though there hasn’t been a single recorded human death from its bite?

7. As featured Thursday: What kind of device are conservationists in Kosovo using to plant seeds in an effort to reforest parts of the country?

8. What color is cochineal dye, which was once an incredibly valuable substance exported from Mexico and used in textiles and paints in Europe?

9. The leaders of what two countries, which are both at odds with the U.S. and several Western democracies, held a high-profile meeting this week to reaffirm their partnership?

10. John F. Kennedy and Richard M. Nixon were the first two U.S. presidential candidates to participate in what activity, which is now scheduled between President Joe Biden and former President Donald Trump?