Article: Copper is an essential trace element in plants and animals, but not some microorganisms. The human body contains copper at a level of about 1.4 to 2.1 mg per kg of body mass. Stated differently, the RDA for copper in normal healthy adults is quoted as 0.97 mg/day and as 3.0 mg/day. Copper is absorbed in the gut, then transported to the liver bound to albumin. After processing in the liver, copper is distributed to other tissues in a second phase. Copper transport here involves the protein ceruloplasmin, which carries the majority of copper in blood. Ceruloplasmin also carries copper that is excreted in milk, and is particularly well-absorbed as a copper source. Copper in the body normally undergoes enterohepatic circulation (about 5 mg a day, vs. about 1 mg per day absorbed in the diet and excreted from the body), and the body is able to excrete some excess copper, if needed, via bile, which carries some copper out of the liver that is not then reabsorbed by the intestine.

Question: What is copper bound with when it is sent to the liver?
Ans: albumin


Article: The third largest city in Spain and the 24th most populous municipality in the European Union, Valencia has a population of 809,267 within its administrative limits on a land area of 134.6 km2 (52 sq mi). The urban area of Valencia extending beyond the administrative city limits has a population of between 1,561,000 and 1,564,145. 1,705,742 or 2,300,000 or 2,516,818 people live in the Valencia metropolitan area. Between 2007 and 2008 there was a 14% increase in the foreign born population with the largest numeric increases by country being from Bolivia, Romania and Italy.

Question: How many inhabitants live within Valencia's limits?
Ans: 809,267


Article: Uranium was also used in photographic chemicals (especially uranium nitrate as a toner), in lamp filaments for stage lighting bulbs, to improve the appearance of dentures, and in the leather and wood industries for stains and dyes. Uranium salts are mordants of silk or wool. Uranyl acetate and uranyl formate are used as electron-dense "stains" in transmission electron microscopy, to increase the contrast of biological specimens in ultrathin sections and in negative staining of viruses, isolated cell organelles and macromolecules.

Question: Along with uranyl formate, what product of uranium is used in transmission electron microscopy?
Ans: Uranyl acetate


Article: The Grands Magasins Dufayel was a huge department store with inexpensive prices built in 1890 in the northern part of Paris, where it reached a very large new customer base in the working class. In a neighborhood with few public spaces, it provided a consumer version of the public square. It educated workers to approach shopping as an exciting social activity not just a routine exercise in obtaining necessities, just as the bourgeoisie did at the famous department stores in the central city. Like the bourgeois stores, it helped transform consumption from a business transaction into a direct relationship between consumer and sought-after goods. Its advertisements promised the opportunity to participate in the newest, most fashionable consumerism at reasonable cost. The latest technology was featured, such as cinemas and exhibits of inventions like X-ray machines (that could be used to fit shoes) and the gramophone.

Question: What were employees taught that made a shopping experience different? 
Ans:
exciting social activity not just a routine exercise in obtaining necessities