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Uranium is used as a colorant in uranium glass producing orange-red to lemon yellow hues. It was also used for tinting and shading in early photography. The 1789 discovery of uranium in the mineral pitchblende is credited to Martin Heinrich Klaproth, who named the new element after the planet Uranus. Eugène-Melchior Péligot was the first person to isolate the metal and its radioactive properties were discovered in 1896 by Henri Becquerel. Research by Otto Hahn, Lise Meitner, Enrico Fermi and others, such as J. Robert Oppenheimer starting in 1934 led to its use as a fuel in the nuclear power industry and in Little Boy, the first nuclear weapon used in war. An ensuing arms race during the Cold War between the United States and the Soviet Union produced tens of thousands of nuclear weapons that used uranium metal and uranium-derived plutonium-239. The security of those weapons and their fissile material following the breakup of the Soviet Union in 1991 is an ongoing concern for public health and safety. See Nuclear proliferation.
What was the first nuclear weapon used in a war called?
A: Little Boy

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Jehovah's Witnesses are perhaps best known for their efforts to spread their beliefs, most notably by visiting people from house to house, distributing literature published by the Watch Tower Society in 700 languages. The objective is to start a regular "Bible study" with any person who is not already a member, with the intention that the student be baptized as a member of the group; Witnesses are advised to consider discontinuing Bible studies with students who show no interest in becoming members. Witnesses are taught they are under a biblical command to engage in public preaching. They are instructed to devote as much time as possible to their ministry and are required to submit an individual monthly "Field Service Report". Baptized members who fail to report a month of preaching are termed "irregular" and may be counseled by elders; those who do not submit reports for six consecutive months are termed "inactive".
How many languages is the Watch Tower Society literature published in?
A: 700

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Seal script, which had evolved slowly in the state of Qin during the Eastern Zhou dynasty, became standardized and adopted as the formal script for all of China in the Qin dynasty (leading to a popular misconception that it was invented at that time), and was still widely used for decorative engraving and seals (name chops, or signets) in the Han dynasty period. However, despite the Qin script standardization, more than one script remained in use at the time. For example, a little-known, rectilinear and roughly executed kind of common (vulgar) writing had for centuries coexisted with the more formal seal script in the Qin state, and the popularity of this vulgar writing grew as the use of writing itself became more widespread. By the Warring States period, an immature form of clerical script called "early clerical" or "proto-clerical" had already developed in the state of Qin based upon this vulgar writing, and with influence from seal script as well. The coexistence of the three scripts – small seal, vulgar and proto-clerical, with the latter evolving gradually in the Qin to early Han dynasties into clerical script – runs counter to the traditional belief that the Qin dynasty had one script only, and that clerical script was suddenly invented in the early Han dynasty from the small seal script.
What was invented in the early Han dynasty from the small seal script?
A: clerical script

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The doctrine of the immaculate conception (Mary being conceived free from original sin) is not to be confused with her virginal conception of her son Jesus. This misunderstanding of the term immaculate conception is frequently met in the mass media. Catholics believe that Mary was not the product of a virginal conception herself but was the daughter of a human father and mother, traditionally known by the names of Saint Joachim and Saint Anne. In 1677, the Holy See condemned the belief that Mary was virginally conceived, which had been a belief surfacing occasionally since the 4th century. The Church celebrates the Feast of the Immaculate Conception (when Mary was conceived free from original sin) on 8 December, exactly nine months before celebrating the Nativity of Mary. The feast of the Annunciation (which commemorates the virginal conception and the Incarnation of Jesus) is celebrated on 25 March, nine months before Christmas Day.
Who believes that Mary is a product of a virginal conception?
A:
unanswerable