Problem:Context: It is notable that, according to Guinness World Records, "White Christmas" (1942) by Bing Crosby is the best-selling single worldwide, with estimated sales of over 50 million copies. The song recognized as "the best-selling single of all time" was released before the pop / rock singles-chart era and "was listed as the world's best-selling single in the first-ever Guinness Book of Records (published in 1955) and -- remarkably -- still retains the title more than 50 years later". Also, Guinness World Records states that double A-side charity single "Candle in the Wind 1997" / "Something About the Way You Look Tonight" (1997) by Elton John, a tribute to the late Diana, Princess of Wales, is "the biggest-selling single since UK and US singles charts began in the 1950s, having accumulated worldwide sales of 33 million copies", making it the second-best-selling single of all time.

Question: number one song of all time in the world?
Solution:OK... To answer this question, we should know that: It is notable that, according to Guinness World Records, "White Christmas" (1942) by Bing Crosby is the best-selling single worldwide, with estimated sales of over 50 million copies.
`` White Christmas '' ( 1942 ) by Bing Crosby.

Student A:The Mid-Atlantic Ridge (MAR) is a mid-ocean ridge, a divergent tectonic plate or constructive plate boundary located along the floor of the Atlantic Ocean, and part of the longest mountain range in the world. In the North Atlantic it separates the Eurasian and North American Plates, and in the South Atlantic it separates the African and South American Plates. The ridge extends from a junction with the Gakkel Ridge (Mid-Arctic Ridge) northeast of Greenland southward to the Bouvet Triple Junction in the South Atlantic. Although the Mid-Atlantic Ridge is mostly an underwater feature, portions of it have enough elevation to extend above sea level. The section of the ridge that includes the island of Iceland is also known as the Reykjanes Ridge. The ridge has an average spreading rate of about 2.5 centimetres (0.98 in) per year.

Where does the mid atlantic ridge start and end?
Student B:OK... The relevant information to answer the above question is: The ridge extends from a junction with the Gakkel Ridge (Mid-Arctic Ridge) northeast of Greenland southward to the Bouvet Triple Junction in the South Atlantic.
extends from a junction with the Gakkel Ridge ( Mid-Arctic Ridge ) northeast of Greenland southward to the Bouvet Triple Junction in the South Atlantic.

Problem:The general appearance of the beagle resembles a miniature Foxhound, but the head is broader and the muzzle shorter, the expression completely different and the legs shorter in proportion to the body. They are generally between 13 and 16 inches (33 and 41 cm) high at the withers and weigh between 18 and 35 lb (8.2 and 15.9 kg), with females being slightly smaller than males on average.

What is the average weight of a beagle?
Solution:OK... The relevant sentence in the passage is: They are generally between 13 and 16 inches (33 and 41 cm) high at the withers and weigh between 18 and 35 lb (8.2 and 15.9 kg), with females being slightly smaller than males on average.
between 18 and 35 lb ( 8.2 and 15.9 kg ).

Student A:Belfast (/ ˈbɛlfɑːst / or /-fæst /; from Irish: Béal Feirste, meaning "rivermouth of the sandbanks") is the capital and largest city of Northern Ireland, and the second largest on the island of Ireland. On the River Lagan, it had a population of 333,871 in 2015. Belfast was granted city status in 1888.

What is the capital and major population center of northern ireland?
Student B:OK... To answer this question, we should know that: Belfast (/ ˈbɛlfɑːst / or /-fæst /; from Irish: Béal Feirste, meaning "rivermouth of the sandbanks") is the capital and largest city of Northern Ireland, and the second largest on the island of Ireland.
Belfast.

Problem:Passage: A coup de grâce (/ ˌkuː də ˈɡrɑːs /; French ( ku də ɡʁɑs) for "blow of mercy" ) is a death blow to end the suffering of a severely wounded person or animal. It may be a mercy killing of civilians or soldiers, friends or enemies, with or without the sufferer's consent.

Question: Based on this passage, what does coup de gras mean in english?
Solution:OK... This is the relevant information: A coup de grâce (/ ˌkuː də ˈɡrɑːs /; French ( ku də ɡʁɑs) for "blow of mercy" ) is a death blow to end the suffering of a severely wounded person or animal.
blow of mercy.

Problem:The Yalta Conference, also known as the Crimea Conference and code named the Argonaut Conference, held from 4 to 11 February, 1945, was the World War II meeting of the heads of government of the United States, the United Kingdom and the Soviet Union for the purpose of discussing Germany and Europe's postwar reorganization. The three states were represented by President Franklin D. Roosevelt, Prime Minister Winston Churchill and Premier Joseph Stalin, respectively. The conference convened near Yalta in Crimea, Soviet Union within the Livadia, Yusupov, and Vorontsov Palaces.

Where was the location of the yalta conference in 1945?
Solution:
OK... To answer this question, we should know that: The conference convened near Yalta in Crimea, Soviet Union within the Livadia, Yusupov, and Vorontsov Palaces.
near Yalta in Crimea , Soviet Union within the Livadia , Yusupov , and Vorontsov Palaces.