Article: The 1960 Four Power Paris Summit between President Dwight Eisenhower, Nikita Khrushchev, Harold Macmillan and Charles de Gaulle collapsed because of the incident. Eisenhower refused to accede to Khrushchev's demands that he apologize. Therefore, Khrushchev would not take part in the summit. Up until this event, Eisenhower felt he had been making progress towards better relations with the Soviet Union. Nuclear arms reduction and Berlin were to have been discussed at the summit. Eisenhower stated it had all been ruined because of that "stupid U-2 business".

Question: Along with Eisenhower, Macmillan and de Gaulle, what leader attended the Four Powers Paris Summit?
Ans: Nikita Khrushchev


Article: London is a leading global city, with strengths in the arts, commerce, education, entertainment, fashion, finance, healthcare, media, professional services, research and development, tourism, and transport all contributing to its prominence. It is one of the world's leading financial centres and has the fifth-or sixth-largest metropolitan area GDP in the world depending on measurement.[note 3] London is a world cultural capital. It is the world's most-visited city as measured by international arrivals and has the world's largest city airport system measured by passenger traffic. London is one of the world's leading investment destinations, hosting more international retailers and ultra high-net-worth individuals than any other city. London's 43 universities form the largest concentration of higher education institutes in Europe, and a 2014 report placed it first in the world university rankings. According to the report London also ranks first in the world in software, multimedia development and design, and shares first position in technology readiness. In 2012, London became the first city to host the modern Summer Olympic Games three times.

Question: How many times has London hosted the Summer Olympic Games?
Ans: three


Article: The interactions of carbonate anions with uranium(VI) cause the Pourbaix diagram to change greatly when the medium is changed from water to a carbonate containing solution. While the vast majority of carbonates are insoluble in water (students are often taught that all carbonates other than those of alkali metals are insoluble in water), uranium carbonates are often soluble in water. This is because a U(VI) cation is able to bind two terminal oxides and three or more carbonates to form anionic complexes.

Question: In what medium does the Pourbaix diagram change when carbonate anions interact with uranium(VI)?
Ans: carbonate containing solution


Article: However, some scholars contest the idea of a Proto-Euphratean language or one substrate language. It has been suggested by them and others, that the Sumerian language was originally that of the hunter and fisher peoples, who lived in the marshland and the Eastern Arabia littoral region, and were part of the Arabian bifacial culture. Reliable historical records begin much later; there are none in Sumer of any kind that have been dated before Enmebaragesi (c. 26th century BC). Professor Juris Zarins believes the Sumerians were settled along the coast of Eastern Arabia, today's Persian Gulf region, before it flooded at the end of the Ice Age.

Question: Where did the original Sumerians live?
Ans:
marshland