Problem: Zinc:

Roughly one quarter of all zinc output in the United States (2009), is consumed in the form of zinc compounds; a variety of which are used industrially. Zinc oxide is widely used as a white pigment in paints, and as a catalyst in the manufacture of rubber. It is also used as a heat disperser for the rubber and acts to protect its polymers from ultraviolet radiation (the same UV protection is conferred to plastics containing zinc oxide). The semiconductor properties of zinc oxide make it useful in varistors and photocopying products. The zinc zinc-oxide cycle is a two step thermochemical process based on zinc and zinc oxide for hydrogen production.

In what form is 1/4 of zinc used in the US?
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A: zinc compounds

Problem: FC Barcelona:

In 1980, when the stadium was in need of redesign to meet UEFA criteria, the club raised money by offering supporters the opportunity to inscribe their name on the bricks for a small fee. The idea was popular with supporters, and thousands of people paid the fee. Later this became the centre of controversy when media in Madrid picked up reports that one of the stones was inscribed with the name of long-time Real Madrid chairman and Franco supporter Santiago Bernabeu. In preparation for the 1992 Summer Olympics two tiers of seating were installed above the previous roofline. It has a current capacity of 99,354 making it the largest stadium in Europe.

Why did the stadium need to be redesigned in 1980?
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A: meet UEFA criteria

Problem: Pacific War:

By April 1945, China had already been at war with Japan for more than seven years. Both nations were exhausted by years of battles, bombings and blockades. After Japanese victories in Operation Ichi-Go, Japan were losing the battle in Burma and facing constant attacks from Chinese Nationalists forces and Communist guerrillas in the country side. The Japanese army began preparations for the Battle of West Hunan in March 1945. Japanese mobilized 34th, 47th, 64th, 68th and 116th Divisions, as well as the 86th Independent Brigade, for a total of 80,000 men to seize Chinese airfields and secure railroads in West Hunan by early April. In response, the Chinese National Military Council dispatched the 4th Front Army and the 10th and 27th Army Groups with He Yingqin as commander-in-chief. At the same time, it airlifted the entire Chinese New 6th Corps, an American-equipped corps and veterans of the Burma Expeditionary Force, from Kunming to Zhijiang. Chinese forces totaled 110,000 men in 20 divisions. They were supported by about 400 aircraft from Chinese and American air forces. Chinese forces achieved a decisive victory and launched a large counterattack in this campaign. Concurrently, the Chinese managed to repel a Japanese offensive in Henan and Hubei. Afterwards, Chinese forces retook Hunan and Hubei provinces in South China. Chinese launched a counter offensive to retake Guangxi which was the last major Japanese stronghold in South China. In August 1945, Chinese forces successfully retook Guangxi.[citation needed]

How many Japanese soldiers were mobilized to capture the Chinese airfields and railroads in West Hunan?
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A: 80,000

Problem: Mammal:

Mammals include the largest animals on the planet, the rorquals and other large whales, as well as some of the most intelligent, such as elephants, primates, including humans, and cetaceans. The basic body type is a four-legged land-borne animal, but some mammals are adapted for life at sea, in the air, in trees, or on two legs. The largest group of mammals, the placentals, have a placenta, which enables feeding the fetus during gestation. Mammals range in size from the 3040 mm (1.21.6 in) bumblebee bat to the 33-meter (108 ft) blue whale.

Which mammal is the smallest?
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A:
bumblebee bat