QUES: The Northwestern library system consists of four libraries on the Evanston campus including the present main library, University Library and the original library building, Deering Library; three libraries on the Chicago campus; and the library affiliated with Garrett-Evangelical Theological Seminary. The University Library contains over 4.9 million volumes, 4.6 million microforms, and almost 99,000 periodicals making it (by volume) the 30th-largest university library in North America and the 10th-largest library among private universities. Notable collections in the library system include the Melville J. Herskovits Library of African Studies, the largest Africana collection in the world, an extensive collection of early edition printed music and manuscripts as well as late-modern works, and an art collection noted for its 19th and 20th-century Western art and architecture periodicals. The library system participates with 15 other universities in digitizing its collections as a part of the Google Book Search project. The Mary and Leigh Block Museum of Art is a major art museum in Chicago, containing more than 4,000 works in its permanent collection as well as dedicating a third of its space to temporary and traveling exhibitions.
How does the University Library rank among South American university libraries?

ANS: unanswerable

QUES: After the Civil War, population expansion, railroad construction, and the disappearance of the buffalo herds heightened military tensions on the Great Plains. Several tribes, especially the Sioux and Comanche, fiercely resisted confinement to reservations. The main role of the Army was to keep indigenous peoples on reservations and to end their wars against settlers and each other, William Tecumseh Sherman and Philip Sheridan were in charge. A famous victory for the Plains Nations was the Battle of the Little Big Horn in 1876, when Col. George Armstrong Custer and two hundred plus members of the 7th Cavalry were killed by a force consisting of Native Americans from the Lakota, Northern Cheyenne, and Arapaho nations. The last significant conflict came in 1891.
Who were two of the military leaders tasked with overseeing African policy of putting Indians on reservations?

ANS: unanswerable

QUES: The synthesis of urea by Friedrich Wohler opened a new research field, organic chemistry, and by the end of the 19th century, scientists were able to synthesize hundreds of organic compounds. The later part of the 19th century saw the exploitation of the Earth's petrochemicals, after the exhaustion of the oil supply from whaling. By the 20th century, systematic production of refined materials provided a ready supply of products which provided not only energy, but also synthetic materials for clothing, medicine, and everyday disposable resources. Application of the techniques of organic chemistry to living organisms resulted in physiological chemistry, the precursor to biochemistry. The 20th century also saw the integration of physics and chemistry, with chemical properties explained as the result of the electronic structure of the atom. Linus Pauling's book on The Nature of the Chemical Bond used the principles of quantum mechanics to deduce bond angles in ever-more complicated molecules. Pauling's work culminated in the physical modelling of DNA, the secret of life (in the words of Francis Crick, 1953). In the same year, the MillerUrey experiment demonstrated in a simulation of primordial processes, that basic constituents of proteins, simple amino acids, could themselves be built up from simpler molecules.
What scientific act is Friedrich Wohler known for?

ANS: The synthesis of urea

QUES: Psychoactive drugs can impair the judgment of time. Stimulants can lead both humans and rats to overestimate time intervals, while depressants can have the opposite effect. The level of activity in the brain of neurotransmitters such as dopamine and norepinephrine may be the reason for this. Such chemicals will either excite or inhibit the firing of neurons in the brain, with a greater firing rate allowing the brain to register the occurrence of more events within a given interval (speed up time) and a decreased firing rate reducing the brain's capacity to distinguish events occurring within a given interval (slow down time).
Such chemicals do what to the firing of the brain's neurons?

ANS:
either excite or inhibit the firing of neurons