Article: Einstein showed in his thought experiments that people travelling at different speeds, while agreeing on cause and effect, measure different time separations between events, and can even observe different chronological orderings between non-causally related events. Though these effects are typically minute in the human experience, the effect becomes much more pronounced for objects moving at speeds approaching the speed of light. Many subatomic particles exist for only a fixed fraction of a second in a lab relatively at rest, but some that travel close to the speed of light can be measured to travel farther and survive much longer than expected (a muon is one example). According to the special theory of relativity, in the high-speed particle's frame of reference, it exists, on the average, for a standard amount of time known as its mean lifetime, and the distance it travels in that time is zero, because its velocity is zero. Relative to a frame of reference at rest, time seems to "slow down" for the particle. Relative to the high-speed particle, distances seem to shorten. Einstein showed how both temporal and spatial dimensions can be altered (or "warped") by high-speed motion.

Question: In what case do these effects become much more noticeable?
Ans: for objects moving at speeds approaching the speed of light.

Article: Arnold, Constable was the first American department store. It was founded in 1825 by Aaron Arnold (1794?-1876), an emigrant from Great Britain, as a small dry goods store on Pine Street in New York City. In 1857 the store moved into a five-story white marble dry goods palace known as the Marble House. During the Civil War Arnold, Constable was one of the first stores to issue charge bills of credit to its customers each month instead of on a bi-annual basis. Recognized as an emporium for high-quality fashions, the store soon outgrew the Marble House and erected a cast-iron building on Broadway and Nineteenth Street in 1869; this "Palace of Trade" expanded over the years until it was necessary to move into a larger space in 1914. In 1925, Arnold, Constable merged with Stewart & Company and expanded into the suburbs, first with a 1937 store in New Rochelle, New York and later in Hempstead and Manhasset on Long Island, and in New Jersey. Financial problems led to bankruptcy in 1975.

Question: Who founded Arnold, Constable?
Ans: Aaron Arnold

Article: Advances in understanding genes and inheritance continued throughout the 20th century. Deoxyribonucleic acid (DNA) was shown to be the molecular repository of genetic information by experiments in the 1940s to 1950s. The structure of DNA was studied by Rosalind Franklin using X-ray crystallography, which led James D. Watson and Francis Crick to publish a model of the double-stranded DNA molecule whose paired nucleotide bases indicated a compelling hypothesis for the mechanism of genetic replication. Collectively, this body of research established the central dogma of molecular biology, which states that proteins are translated from RNA, which is transcribed from DNA. This dogma has since been shown to have exceptions, such as reverse transcription in retroviruses. The modern study of genetics at the level of DNA is known as molecular genetics.

Question: What was shown to be the molecular repository of genetic information by experiments in the 1940s to 1950s?
Ans: Deoxyribonucleic acid (DNA)

Article: Mexico City is one of the most important economic hubs in Latin America. The city proper (Federal District) produces 15.8% of the country's gross domestic product. According to a study conducted by PwC, Mexico City had a GDP of $390 billion, ranking it as the eighth richest city in the world after the greater metropolitan areas of Tokyo, New York City, Los Angeles, Chicago, Paris, London and Osaka/Kobe (and the richest in the whole of Latin America). Excluding the rest of the Mexican economy, Mexico City alone would rank as the 30th largest economy in the world. Mexico City is the greatest contributor to the country's industrial GDP (15.8%) and also the greatest contributor to the country's GDP in the service sector (25.3%). Due to the limited non-urbanized space at the southmost of which is protected through environmental lawsthe contribution of the Federal District in agriculture is the smallest of all federal entities in the country. Mexico City has one of the world's fastest-growing economies and its GDP is set to double by 2020.

Question: What percentage of service sector national GDP does Mexico City account for?
Ans:
25.3