Article: Linking the information back together is the key to this system. In the relational model, some bit of information was used as a "key", uniquely defining a particular record. When information was being collected about a user, information stored in the optional tables would be found by searching for this key. For instance, if the login name of a user is unique, addresses and phone numbers for that user would be recorded with the login name as its key. This simple "re-linking" of related data back into a single collection is something that traditional computer languages are not designed for.

Question: What is a key used for?
Ans: uniquely defining a particular record

Here is a question about this article: Since annelids are soft-bodied, their fossils are rare. Polychaetes' fossil record consists mainly of the jaws that some species had and the mineralized tubes that some secreted. Some Ediacaran fossils such as Dickinsonia in some ways resemble polychaetes, but the similarities are too vague for these fossils to be classified with confidence. The small shelly fossil Cloudina, from 549 to 542 million years ago, has been classified by some authors as an annelid, but by others as a cnidarian (i.e. in the phylum to which jellyfish and sea anemones belong). Until 2008 the earliest fossils widely accepted as annelids were the polychaetes Canadia and Burgessochaeta, both from Canada's Burgess Shale, formed about 505 million years ago in the early Cambrian. Myoscolex, found in Australia and a little older than the Burgess Shale, was possibly an annelid. However, it lacks some typical annelid features and has features which are not usually found in annelids and some of which are associated with other phyla. Then Simon Conway Morris and John Peel reported Phragmochaeta from Sirius Passet, about 518 million years old, and concluded that it was the oldest annelid known to date. There has been vigorous debate about whether the Burgess Shale fossil Wiwaxia was a mollusc or an annelid. Polychaetes diversified in the early Ordovician, about 488 to 474 million years ago. It is not until the early Ordovician that the first annelid jaws are found, thus the crown-group cannot have appeared before this date and probably appeared somewhat later. By the end of the Carboniferous, about 299 million years ago, fossils of most of the modern mobile polychaete groups had appeared. Many fossil tubes look like those made by modern sessile polychaetes , but the first tubes clearly produced by polychaetes date from the Jurassic, less than 199 million years ago.
What is the answer to this question: Where was Myoscolex found?
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So... Australia

The problem: Answer a question about this article:
Sporadic epigraphic evidence in grave site excavations, particularly in Brigetio (Szony), Aquincum (Obuda), Intercisa (Dunaujvaros), Triccinae (Sarvar), Savaria (Szombathely), Sopianae (Pecs), and Osijek in Croatia, attest to the presence of Jews after the 2nd and 3rd centuries where Roman garrisons were established, There was a sufficient number of Jews in Pannonia to form communities and build a synagogue. Jewish troops were among the Syrian soldiers transferred there, and replenished from the Middle East, after 175 C.E. Jews and especially Syrians came from Antioch, Tarsus and Cappadocia. Others came from Italy and the Hellenized parts of the Roman empire. The excavations suggest they first lived in isolated enclaves attached to Roman legion camps, and intermarried among other similar oriental families within the military orders of the region.Raphael Patai states that later Roman writers remarked that they differed little in either customs, manner of writing, or names from the people among whom they dwelt; and it was especially difficult to differentiate Jews from the Syrians. After Pannonia was ceded to the Huns in 433, the garrison populations were withdrawn to Italy, and only a few, enigmatic traces remain of a possible Jewish presence in the area some centuries later.
In what year were the Roman garrison populations withdrawn to Italy?
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The answer: 433

Problem: Please answer a question about the following article about Party leaders of the United States House of Representatives:
Starting with Republican Nicholas Longworth in 1925, and continued through the Democrats' control of the House from 1931 to 1995, save for Republican majorities in 194749 and 195355, all majority leaders have directly ascended to the Speakership brought upon by the retirement of the incumbent. The only exceptions during this period were Charles A. Halleck who became Republican House leader and Minority Leader from 1959 to 1965, Hale Boggs who died in a plane crash, and Dick Gephardt who became the Democrats' House leader but as Minority Leader since his party lost control in the 1994 midterm elections. Since 1995, the only Majority Leader to become Speaker is John Boehner, though indirectly as his party lost control in the 2006 midterms elections. He subsequently served as Republican House leader and Minority Leader from 2007 to 2011 and then was elected Speaker when the House reconvened in 2011. In 1998, with Speaker Newt Gingrich announcing his resignation, both Majority Leader Dick Armey and Majority Whip Tom DeLay did not contest the Speakership which eventually went to Chief Deputy Whip Dennis Hastert.
What republican majority leader died in a plane crash?
A: Hale Boggs

Question: Read this and answer the question

On 28 January 2012, police arrested four current and former staff members of The Sun, as part of a probe in which journalists paid police officers for information; a police officer was also arrested in the probe. The Sun staffers arrested were crime editor Mike Sullivan, head of news Chris Pharo, former deputy editor Fergus Shanahan, and former managing editor Graham Dudman, who since became a columnist and media writer. All five arrested were held on suspicion of corruption. Police also searched the offices of News International, the publishers of The Sun, as part of a continuing investigation into the News of the World scandal.

What role had Graham Dudman taken after serving as The Sun managing editor?
Answer: columnist and media writer

The foundation of Northwestern University is traceable to a meeting on May 31, 1850 of nine prominent Chicago businessmen, Methodist leaders and attorneys who had formed the idea of establishing a university to serve what had once been known as the Northwest Territory. On January 28, 1851, the Illinois General Assembly granted a charter to the Trustees of the North-Western University, making it the first chartered university in Illinois. The school's nine founders, all of whom were Methodists (three of them ministers), knelt in prayer and worship before launching their first organizational meeting. Although they affiliated the university with the Methodist Episcopal Church, they were committed to non-sectarian admissions, believing that Northwestern should serve all people in the newly developing territory.
What was the date that lay down the foundation for Northwestern University?
May 31, 1850