Article: Starting on 30 April 1916, Germany and its World War I ally Austria-Hungary were the first to use DST (German: Sommerzeit) as a way to conserve coal during wartime. Britain, most of its allies, and many European neutrals soon followed suit. Russia and a few other countries waited until the next year and the United States adopted it in 1918.

Question: What natural resource were Germany and Austria-Hungary trying to conserve by using DST?
Ans: coal

Here is a question about this article: Zinc is included in most single tablet over-the-counter daily vitamin and mineral supplements. Preparations include zinc oxide, zinc acetate, and zinc gluconate. It is believed to possess antioxidant properties, which may protect against accelerated aging of the skin and muscles of the body; studies differ as to its effectiveness. Zinc also helps speed up the healing process after an injury. It is also suspected of being beneficial to the body's immune system. Indeed, zinc deficiency may have effects on virtually all parts of the human immune system.
What is the answer to this question: What property of zinc is believed to protect against skin aging?
****
So... antioxidant

The problem: Answer a question about this article:
The portion of the city south of the James River is known as the Southside. Neighborhoods in the city's Southside area range from affluent and middle class suburban neighborhoods Westover Hills, Forest Hill, Southampton, Stratford Hills, Oxford, Huguenot Hills, Hobby Hill, and Woodland Heights to the impoverished Manchester and Blackwell areas, the Hillside Court housing projects, and the ailing Jefferson Davis Highway commercial corridor. Other Southside neighborhoods include Fawnbrook, Broad Rock, Cherry Gardens, Cullenwood, and Beaufont Hills. Much of Southside developed a suburban character as part of Chesterfield County before being annexed by Richmond, most notably in 1970.
Along with the affluent, what is the socioeconomic class of the inhabitants of the Southside?
****
The answer: middle class

Problem: Please answer a question about the following article about New York City:
In 1609, English explorer Henry Hudson re-discovered the region when he sailed his ship the Halve Maen ("Half Moon" in Dutch) into New York Harbor while searching for the Northwest Passage to the Orient for his employer, the Dutch East India Company. He proceeded to sail up what he named the North River, also called the Mauritis River, and now known as the Hudson River, to the site of the present-day New York State capital of Albany in the belief that it might represent an oceanic tributary. When the river narrowed and was no longer saline, he realized it was not a maritime passage and sailed back downriver. He made a ten-day exploration of the area and claimed the region for his employer. In 1614, the area between Cape Cod and Delaware Bay would be claimed by the Netherlands and called Nieuw-Nederland (New Netherland).
In what year was the land between Cape Cod and Delaware Bay claimed by the Dutch?
A: 1614

Question: Read this and answer the question

Classical immunology ties in with the fields of epidemiology and medicine. It studies the relationship between the body systems, pathogens, and immunity. The earliest written mention of immunity can be traced back to the plague of Athens in 430 BCE. Thucydides noted that people who had recovered from a previous bout of the disease could nurse the sick without contracting the illness a second time. Many other ancient societies have references to this phenomenon, but it was not until the 19th and 20th centuries before the concept developed into scientific theory.

Which Greek historian made that notation?
Answer: Thucydides

The palace measures 108 metres (354 ft) by 120 metres (390 ft), is 24 metres (79 ft) high and contains over 77,000 m2 (830,000 sq ft) of floorspace. The floor area is smaller than the Royal Palace of Madrid, the Papal Palace in Rome, the Louvre in Paris, the Hofburg Palace in Vienna, or the Forbidden City. There are 775 rooms, including 19 state rooms, 52 principal bedrooms, 188 staff bedrooms, 92 offices, and 78 bathrooms. The principal rooms are contained on the piano nobile behind the west-facing garden facade at the rear of the palace. The centre of this ornate suite of state rooms is the Music Room, its large bow the dominant feature of the facade. Flanking the Music Room are the Blue and the White Drawing Rooms. At the centre of the suite, serving as a corridor to link the state rooms, is the Picture Gallery, which is top-lit and 55 yards (50 m) long. The Gallery is hung with numerous works including some by Rembrandt, van Dyck, Rubens and Vermeer; other rooms leading from the Picture Gallery are the Throne Room and the Green Drawing Room. The Green Drawing Room serves as a huge anteroom to the Throne Room, and is part of the ceremonial route to the throne from the Guard Room at the top of the Grand Staircase. The Guard Room contains white marble statues of Queen Victoria and Prince Albert, in Roman costume, set in a tribune lined with tapestries. These very formal rooms are used only for ceremonial and official entertaining, but are open to the public every summer.
How many staterooms does the palace have?
19 state rooms