Article: 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.

Question: How many persons were necessary to operate an iron plow?
Ans: one man


Here is a question about this article: Adult insects typically move about by walking, flying, or sometimes swimming (see below, Locomotion). As it allows for rapid yet stable movement, many insects adopt a tripedal gait in which they walk with their legs touching the ground in alternating triangles. Insects are the only invertebrates to have evolved flight. Many insects spend at least part of their lives under water, with larval adaptations that include gills, and some adult insects are aquatic and have adaptations for swimming. Some species, such as water striders, are capable of walking on the surface of water. Insects are mostly solitary, but some, such as certain bees, ants and termites, are social and live in large, well-organized colonies. Some insects, such as earwigs, show maternal care, guarding their eggs and young. Insects can communicate with each other in a variety of ways. Male moths can sense the pheromones of female moths over great distances. Other species communicate with sounds: crickets stridulate, or rub their wings together, to attract a mate and repel other males. Lampyridae in the beetle order Coleoptera communicate with light.
What is the answer to this question: What do crickets do in order to attract or repel a mate?
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So... stridulate


The problem: Answer a question about this article:
Lossy audio compression is used in a wide range of applications. In addition to the direct applications (mp3 players or computers), digitally compressed audio streams are used in most video DVDs, digital television, streaming media on the internet, satellite and cable radio, and increasingly in terrestrial radio broadcasts. Lossy compression typically achieves far greater compression than lossless compression (data of 5 percent to 20 percent of the original stream, rather than 50 percent to 60 percent), by discarding less-critical data.
What compression usually achieves far greater compression then lossless? 
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The answer: Lossy


Problem: Please answer a question about the following article about Presbyterianism:
In Brazil, the Presbyterian Church of Brazil (Igreja Presbiteriana do Brasil) totals approximately 1,011,300 members; other Presbyterian churches (Independents, United, Conservatives, Renovated, etc.) in this nation have around 350,000 members. The Renewed Presbyterian Church in Brazil was influenced by the charismatic movement and has about 131 000 members as of 2011. The Conservative Presbyterian Church was founded in 1940 and has eight presbyteries. The Fundamentalist Presbyterian church in Brazil was influenced by Karl McIntosh and the Bible Presbyterian church USA and has around 1 800 members. The Independent Presbyterian Church in Brasil was founded in 1903 by pastor Pereira, has 500 congregations and 75 000 members. The United Presbyterian Church in Brazil has around 4 000 members. There are also ethnic Korean Presbyterian churches in the country. The Evangelical Reformed Church in Brazil has Dutch origin. The Reformed Churches in Brazil were recently founded by the Canadian Reformed Churches with the Reformed Church in the Netherlands (liberated).
How many members are in the Presbyterian Church of Brazil?
A: 1,011,300


Question: Read this and answer the question

Many social scientists have replaced the word race with the word "ethnicity" to refer to self-identifying groups based on beliefs concerning shared culture, ancestry and history. Alongside empirical and conceptual problems with "race", following the Second World War, evolutionary and social scientists were acutely aware of how beliefs about race had been used to justify discrimination, apartheid, slavery, and genocide. This questioning gained momentum in the 1960s during the U.S. civil rights movement and the emergence of numerous anti-colonial movements worldwide. They thus came to believe that race itself is a social construct, a concept that was believed to correspond to an objective reality but which was believed in because of its social functions.

What movement gained momentum worldwide in the 60's?
Answer: anti-colonial


As of 2010, those of (non-Hispanic white) European ancestry accounted for 57.9% of Florida's population. Out of the 57.9%, the largest groups were 12.0% German (2,212,391), 10.7% Irish (1,979,058), 8.8% English (1,629,832), 6.6% Italian (1,215,242), 2.8% Polish (511,229), and 2.7% French (504,641). White Americans of all European backgrounds are present in all areas of the state. In 1970, non-Hispanic whites were nearly 80% of Florida's population. Those of English and Irish ancestry are present in large numbers in all the urban/suburban areas across the state. Some native white Floridians, especially those who have descended from long-time Florida families, may refer to themselves as "Florida crackers"; others see the term as a derogatory one. Like whites in most of the other Southern states, they descend mainly from English and Scots-Irish settlers, as well as some other British American settlers.
Most  white  Florida Immigrants descend from
mainly from English and Scots-Irish settlers, as well as some other British American settlers