Article: The racial categories represent a social-political construct for the race or races that respondents consider themselves to be and "generally reflect a social definition of race recognized in this country." OMB defines the concept of race as outlined for the U.S. Census as not "scientific or anthropological" and takes into account "social and cultural characteristics as well as ancestry", using "appropriate scientific methodologies" that are not "primarily biological or genetic in reference." The race categories include both racial and national-origin groups.

Question: Who defines the concept of race in the United States Census?
Ans: OMB

Article: The family of instruments used, especially in orchestras, grew. A wider array of percussion instruments began to appear. Brass instruments took on larger roles, as the introduction of rotary valves made it possible for them to play a wider range of notes. The size of the orchestra (typically around 40 in the Classical era) grew to be over 100. Gustav Mahler's 1906 Symphony No. 8, for example, has been performed with over 150 instrumentalists and choirs of over 400.

Question: What array of instrument grew wider?
Ans: percussion

Article: London's buildings are too diverse to be characterised by any particular architectural style, partly because of their varying ages. Many grand houses and public buildings, such as the National Gallery, are constructed from Portland stone. Some areas of the city, particularly those just west of the centre, are characterised by white stucco or whitewashed buildings. Few structures in central London pre-date the Great Fire of 1666, these being a few trace Roman remains, the Tower of London and a few scattered Tudor survivors in the City. Further out is, for example, the Tudor period Hampton Court Palace, England's oldest surviving Tudor palace, built by Cardinal Thomas Wolsey c.1515.

Question: What, in part, is the reason for London's lack of a singularly characteristic architectural style among its buildings?
Ans: their varying ages

Article: Boston has a continental climate with some maritime influence, and using the 3 C (27 F) coldest month (January) isotherm, the city lies within the transition zone from a humid subtropical climate (Koppen Cfa) to a humid continental climate (Koppen Dfa), although the suburbs north and west of the city are significantly colder in winter and solidly fall under the latter categorization; the city lies at the transition between USDA plant hardiness zones 6b (most of the city) and 7a (Downtown, South Boston, and East Boston neighborhoods). Summers are typically warm to hot, rainy, and humid, while winters oscillate between periods of cold rain and snow, with cold temperatures. Spring and fall are usually mild, with varying conditions dependent on wind direction and jet stream positioning. Prevailing wind patterns that blow offshore minimize the influence of the Atlantic Ocean. The hottest month is July, with a mean temperature of 73.4 F (23.0 C). The coldest month is January, with a mean of 29.0 F (1.7 C). Periods exceeding 90 F (32 C) in summer and below freezing in winter are not uncommon but rarely extended, with about 13 and 25 days per year seeing each, respectively. The most recent sub-0 F (18 C) reading occurring on February 14, 2016 when the temperature dipped down to 9 F (23 C), the coldest reading since 1957. In addition, several decades may pass between 100 F (38 C) readings, with the most recent such occurrence on July 22, 2011 when the temperature reached 103 F (39 C). The city's average window for freezing temperatures is November 9 through April 5.[c] Official temperature records have ranged from 18 F (28 C) on February 9, 1934, up to 104 F (40 C) on July 4, 1911; the record cold daily maximum is 2 F (17 C) on December 30, 1917, while, conversely, the record warm daily minimum is 83 F (28 C) on August 2, 1975.

Question: What is the coldest month in Boston?
Ans:
January