Article: In nature, uranium is found as uranium-238 (99.2742%) and uranium-235 (0.7204%). Isotope separation concentrates (enriches) the fissionable uranium-235 for nuclear weapons and most nuclear power plants, except for gas cooled reactors and pressurised heavy water reactors. Most neutrons released by a fissioning atom of uranium-235 must impact other uranium-235 atoms to sustain the nuclear chain reaction. The concentration and amount of uranium-235 needed to achieve this is called a 'critical mass'.

Question: Along with gas cooled reactors, what type of reactor doesn't use uranium-235?
Ans: pressurised heavy water

Article: Though the proportions were always important in Greek art, the appeal of the Greek sculptures eludes any explanation by proportion alone. The statues of Apollo were thought to incarnate his living presence, and these representations of illusive imaginative reality had deep roots in the Minoan period, and in the beliefs of the first Greek speaking people who entered the region during the bronze-age. Just as the Greeks saw the mountains, forests, sea and rivers as inhabited by concrete beings, so nature in all of its manifestations possesses clear form, and the form of a work of art. Spiritual life is incorporated in matter, when it is given artistic form. Just as in the arts the Greeks sought some reality behind appearances, so in mathematics they sought permanent principles which could be applied wherever the conditions were the same. Artists and sculptors tried to find this ideal order in relation with mathematics, but they believed that this ideal order revealed itself not so much to the dispassionate intellect, as to the whole sentient self. Things as we see them, and as they really are, are one, that each stresses the nature of the other in a single unity.

Question: The statues of who were thought to incarnate his living presence?
Ans: Apollo

Article: Victoria was physically unprepossessingshe was stout, dowdy and no more than five feet tallbut she succeeded in projecting a grand image. She experienced unpopularity during the first years of her widowhood, but was well liked during the 1880s and 1890s, when she embodied the empire as a benevolent matriarchal figure. Only after the release of her diary and letters did the extent of her political influence become known to the wider public. Biographies of Victoria written before much of the primary material became available, such as Lytton Strachey's Queen Victoria of 1921, are now considered out of date. The biographies written by Elizabeth Longford and Cecil Woodham-Smith, in 1964 and 1972 respectively, are still widely admired. They, and others, conclude that as a person Victoria was emotional, obstinate, honest, and straight-talking.

Question: When were the best biographies of Queen Victoria written?
Ans: 1964 and 1972

Article: Beginning as a self-help program in the mid-1960s, the Cotton Research and Promotion Program (CRPP) was organized by U.S. cotton producers in response to cotton's steady decline in market share. At that time, producers voted to set up a per-bale assessment system to fund the program, with built-in safeguards to protect their investments. With the passage of the Cotton Research and Promotion Act of 1966, the program joined forces and began battling synthetic competitors and re-establishing markets for cotton. Today, the success of this program has made cotton the best-selling fiber in the U.S. and one of the best-selling fibers in the world.[citation needed]

Question: What prompted a help program produced by cotton producers in the 1960s?
Ans:
decline in market share