The problem: Answer a question about this article:
Though Han wooden structures decayed, some Han-dynasty ruins made of brick, stone, and rammed earth remain intact. This includes stone pillar-gates, brick tomb chambers, rammed-earth city walls, rammed-earth and brick beacon towers, rammed-earth sections of the Great Wall, rammed-earth platforms where elevated halls once stood, and two rammed-earth castles in Gansu. The ruins of rammed-earth walls that once surrounded the capitals Chang'an and Luoyang still stand, along with their drainage systems of brick arches, ditches, and ceramic water pipes. Monumental stone pillar-gates, twenty-nine of which survive from the Han period, formed entrances of walled enclosures at shrine and tomb sites. These pillars feature artistic imitations of wooden and ceramic building components such as roof tiles, eaves, and balustrades.
What were the walls that encompassed the city of Luoyang comprised of?
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The answer: rammed-earth

Problem: Please answer a question about the following article about Anti-aircraft warfare:
In some countries, such as Britain and Germany during the Second World War, the Soviet Union and NATO's Allied Command Europe, ground based air defence and air defence aircraft have been under integrated command and control. However, while overall air defence may be for homeland defence including military facilities, forces in the field, wherever they are, invariably deploy their own air defence capability if there is an air threat. A surface-based air defence capability can also be deployed offensively to deny the use of airspace to an opponent.
What other group has also been under this integrated command and control?
A: NATO's Allied Command Europe

Question: Read this and answer the question

The English sailor and adventurer William Adams (15641620) was the first Westerner to receive the dignity of samurai. The Shogun Tokugawa Ieyasu presented him with two swords representing the authority of a samurai, and decreed that William Adams the sailor was dead and that Anjin Miura (), a samurai, was born. Adams also received the title of hatamoto (bannerman), a high-prestige position as a direct retainer in the Shogun's court. He was provided with generous revenues: "For the services that I have done and do daily, being employed in the Emperor's service, the Emperor has given me a living" (Letters). He was granted a fief in Hemi () within the boundaries of present-day Yokosuka City, "with eighty or ninety husbandmen, that be my slaves or servants" (Letters). His estate was valued at 250 koku. He finally wrote "God hath provided for me after my great misery", (Letters) by which he meant the disaster-ridden voyage that initially brought him to Japan.

What did hatamoto mean?
Answer: bannerman

Problem: The term mainly refers to a mix of lithium and aluminosilicates that yields an array of materials with interesting thermomechanical properties. The most commercially important of these have the distinction of being impervious to thermal shock. Thus, glass-ceramics have become extremely useful for countertop cooking. The negative thermal expansion coefficient (CTE) of the crystalline ceramic phase can be balanced with the positive CTE of the glassy phase. At a certain point (~70% crystalline) the glass-ceramic has a net CTE near zero. This type of glass-ceramic exhibits excellent mechanical properties and can sustain repeated and quick temperature changes up to 1000 C.
What proportion of crystalline ceramics yields a product with a CTE of around 0?
The answer is the following: ~70%

Having attended art college, Mercury also designed Queen's logo, called the Queen crest, shortly before the release of the band's first album. The logo combines the zodiac signs of all four members: two lions for Leo (Deacon and Taylor), a crab for Cancer (May), and two fairies for Virgo (Mercury). The lions embrace a stylised letter Q, the crab rests atop the letter with flames rising directly above it, and the fairies are each sheltering below a lion. There is also a crown inside the Q and the whole logo is over-shadowed by an enormous phoenix. The whole symbol bears a passing resemblance to the Royal coat of arms of the United Kingdom, particularly with the lion supporters. The original logo, as found on the reverse-side of the first album cover, was a simple line drawing but more intricate colour versions were used on later sleeves.
What was Freddie Mercury's zodiac sign?
Virgo

Here is a question about this article: From its origins in the fur trade, the Hudson's Bay Company is the oldest corporation in North America and was the largest department store operator in Canada until the mid-1980s, with locations across the country. It also previously owned Zellers, another major Canadian department store which ceased to exist in March 2013 after selling its lease holdings to Target Canada. Other department stores in Canada are: Canadian Tire, Sears Canada, Ogilvy, Les Ailes de la Mode, Giant Tiger, Co-op, Costco and Holt Renfrew. Grocery giant Superstores carry many non-grocery items akin to a department store. Woolco had 160 stores in Canada when operations ceased (Walmart bought out Woolco in 1994). Today low-price Walmart is by far the most dominant department store retailer in Canada with outlets throughout the country. Historically, department stores were a significant component in Canadian economic life, and chain stores such as Eaton's, Charles Ogilvy Limited, Freiman's, Spencer's, Simpsons, Morgan's, and Woodward's were staples in their respective communities. Department stores in Canada are similar in design and style to department stores in the United States.
What is the answer to this question: What business was the Hudson's Bay Company originally involved in?
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So...
the fur trade