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This method produces the clear plastic blank part of the disc. After a metallic reflecting layer (usually aluminium, but sometimes gold or other metal) is applied to the clear blank substrate, the disc goes under a UV light for curing and it is ready to go to press. To prepare to press a CD, a glass master is made, using a high-powered laser on a device similar to a CD writer. The glass master is a positive image of the desired CD surface (with the desired microscopic pits and lands). After testing, it is used to make a die by pressing it against a metal disc.
How are the pits and lands made?
A: unanswerable

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On March 4, 1989, the Memorial Society, committed to honoring the victims of Stalinism and cleansing society of Soviet practices, was founded in Kiev. A public rally was held the next day. On March 12, A pre-election meeting organized in Lviv by the Ukrainian Helsinki Union and the Marian Society Myloserdia (Compassion) was violently dispersed, and nearly 300 people were detained. On March 26, elections were held to the union Congress of People's Deputies; by-elections were held on April 9, May 14, and May 21. Among the 225 Ukrainian deputies, most were conservatives, though a handful of progressives made the cut.
Members of what ideology were more heavily elected to the union Congress of People's Deputies?
A: conservatives

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In June 1963, Rev. Martin Luther King, Jr. gave a major speech in Detroit that foreshadowed his "I Have a Dream" speech in Washington, D.C. two months later. While the African-American Civil Rights Movement gained significant federal civil rights laws in 1964 and 1965, longstanding inequities resulted in confrontations between the police and inner city black youth wanting change. Longstanding tensions in Detroit culminated in the Twelfth Street riot in July 1967. Governor George W. Romney ordered the Michigan National Guard into Detroit, and President Johnson sent in U.S. Army troops. The result was 43 dead, 467 injured, over 7,200 arrests, and more than 2,000 buildings destroyed, mostly in black residential and business areas. Thousands of small businesses closed permanently or relocated to safer neighborhoods. The affected district lay in ruins for decades. It was the most costly riot in the United States.
How many people were killed in the Twelfth Street riots?
A: 43

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The Guangxu Emperor died on November 14, 1908, and on November 15, 1908, Cixi also died. Rumors held that she or Yuan Shikai ordered trusted eunuchs to poison the Guangxu Emperor, and an autopsy conducted nearly a century later confirmed lethal levels of arsenic in his corpse. Puyi, the oldest son of Zaifeng, Prince Chun, and nephew to the childless Guangxu Emperor, was appointed successor at the age of two, leaving Zaifeng with the regency. This was followed by the dismissal of General Yuan Shikai from his former positions of power. In April 1911 Zaifeng created a cabinet in which there were two vice-premiers. Nonetheless, this cabinet was also known by contemporaries as "The Royal Cabinet" because among the thirteen cabinet members, five were members of the imperial family or Aisin Gioro relatives. This brought a wide range of negative opinions from senior officials like Zhang Zhidong. The Wuchang Uprising of October 10, 1911, led to the creation of a new central government, the Republic of China, in Nanjing with Sun Yat-sen as its provisional head. Many provinces soon began "separating" from Qing control. Seeing a desperate situation unfold, the Qing government brought Yuan Shikai back to military power. He took control of his Beiyang Army to crush the revolution in Wuhan at the Battle of Yangxia. After taking the position of Prime Minister and creating his own cabinet, Yuan Shikai went as far as to ask for the removal of Zaifeng from the regency. This removal later proceeded with directions from Empress Dowager Longyu.
How old was Prince Chun?
A:
two