The problem: Answer a question about this article:
Sociologists and criminologists have not reached consensus on the explanation for the dramatic decrease in the city's crime rate. Some attribute the phenomenon to new tactics used by the NYPD, including its use of CompStat and the broken windows theory. Others cite the end of the crack epidemic and demographic changes, including from immigration. Another theory is that widespread exposure to lead pollution from automobile exhaust, which can lower intelligence and increase aggression levels, incited the initial crime wave in the mid-20th century, most acutely affecting heavily trafficked cities like New York. A strong correlation was found demonstrating that violent crime rates in New York and other big cities began to fall after lead was removed from American gasoline in the 1970s. Another theory cited to explain New York City's falling homicide rate is the inverse correlation between the number of murders and the increasingly wetter climate in the city.
Being exposed to what type of pollution has been theorized to increase aggression?
****
The answer: lead


The problem: Answer a question about this article:
The members of the city council are each elected from single member districts within the city. The mayor and city attorney are elected directly by the voters of the entire city. The mayor, city attorney, and council members are elected to four-year terms, with a two-term limit. Elections are held on a non-partisan basis per California state law; nevertheless, most officeholders do identify themselves as either Democrats or Republicans. In 2007, registered Democrats outnumbered Republicans by about 7 to 6 in the city, and Democrats currently (as of 2015[update]) hold a 5-4 majority in the city council. The current mayor, Kevin Faulconer, is a Republican.
Who elects members of city council?
****
The answer: single member districts within the city


The problem: Answer a question about this article:
New York City is the most-populous city in the United States, with an estimated record high of 8,491,079 residents as of 2014, incorporating more immigration into the city than outmigration since the 2010 United States Census. More than twice as many people live in New York City as in the second-most populous U.S. city (Los Angeles), and within a smaller area. New York City gained more residents between April 2010 and July 2014 (316,000) than any other U.S. city. New York City's population amounts to about 40% of New York State's population and a similar percentage of the New York metropolitan area population.
About what percentage is New York City's population of the New York metropolitan area's population?
****
The answer: 40%


The problem: Answer a question about this article:
Until the 16th century, the Low Countries – corresponding roughly to the present-day Netherlands, Belgium, and Luxembourg – consisted of a number of duchies, counties, and Prince-bishoprics, almost all of which were under the supremacy of the Holy Roman Empire, with the exception of the county of Flanders, which was under the Kingdom of France.
The Low Countries were made up of which present day countries?
****
The answer:
Netherlands, Belgium, and Luxembourg