Problem: The Han-era Chinese used bronze and iron to make a range of weapons, culinary tools, carpenters' tools and domestic wares. A significant product of these improved iron-smelting techniques was the manufacture of new agricultural tools. The three-legged iron seed drill, invented by the 2nd century BC, enabled farmers to carefully plant crops in rows instead of casting seeds out by hand. The heavy moldboard iron plow, also invented during the Han dynasty, required only one man to control it, two oxen to pull it. It had three plowshares, a seed box for the drills, a tool which turned down the soil and could sow roughly 45,730 m2 (11.3 acres) of land in a single day.
What was an invention that allowed farmers to place their crops into rows?
The answer is the following: The three-legged iron seed drill

Problem: New York City has been a metropolitan municipality with a mayor-council form of government since its consolidation in 1898. The government of New York is more centralized than that of most other U.S. cities. In New York City, the city government is responsible for public education, correctional institutions, public safety, recreational facilities, sanitation, water supply, and welfare services.
In what year did New York City adopt the mayor-council form of government?
The answer is the following: 1898

Problem: The University of St Mark & St John (known as "Marjon" or "Marjons") specialises in teacher training, and offers training across the country and abroad.
What institution of higher education is colloquially known as Marjons?
The answer is the following: The University of St Mark & St John

Problem: In the United States, the practice of racial profiling has been ruled to be both unconstitutional and a violation of civil rights. There is active debate regarding the cause of a marked correlation between the recorded crimes, punishments meted out, and the country's populations. Many consider de facto racial profiling an example of institutional racism in law enforcement. The history of misuse of racial categories to impact adversely one or more groups and/or to offer protection and advantage to another has a clear impact on debate of the legitimate use of known phenotypical or genotypical characteristics tied to the presumed race of both victims and perpetrators by the government.
Where has the practice of racial profiling been ruled to be unconstitutional?
The answer is the following:
United States