The problem: Answer a question about this article:
First recognized in 1900 by Max Planck, it was originally the proportionality constant between the minimal increment of energy, E, of a hypothetical electrically charged oscillator in a cavity that contained black body radiation, and the frequency, f, of its associated electromagnetic wave. In 1905 the value E, the minimal energy increment of a hypothetical oscillator, was theoretically associated by Einstein with a "quantum" or minimal element of the energy of the electromagnetic wave itself. The light quantum behaved in some respects as an electrically neutral particle, as opposed to an electromagnetic wave. It was eventually called the photon.
Who discovered an association between the value E and quantum energy?
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The answer: Einstein


The problem: Answer a question about this article:
Jonas Bronck (c. 1600–43) was a Swedish born emigrant from Komstad, Norra Ljunga parish in Småland, Sweden who arrived in New Netherland during the spring of 1639. He became the first recorded European settler in the area now known as the Bronx. He leased land from the Dutch West India Company on the neck of the mainland immediately north of the Dutch settlement in Harlem (on Manhattan island), and bought additional tracts from the local tribes. He eventually accumulated 500 acres (about 2 square km, or 3/4 of a square mile) between the Harlem River and the Aquahung, which became known as Bronck's River, or The Bronx. Dutch and English settlers referred to the area as Bronck's Land. The American poet William Bronk was a descendant of Pieter Bronck, either Jonas Bronck's son or his younger brother.
Where did Bronck emigrate from?
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The answer: Småland, Sweden


The problem: Answer a question about this article:
Beer was spread through Europe by Germanic and Celtic tribes as far back as 3000 BC, and it was mainly brewed on a domestic scale. The product that the early Europeans drank might not be recognised as beer by most people today. Alongside the basic starch source, the early European beers might contain fruits, honey, numerous types of plants, spices and other substances such as narcotic herbs. What they did not contain was hops, as that was a later addition, first mentioned in Europe around 822 by a Carolingian Abbot and again in 1067 by Abbess Hildegard of Bingen.
What was a Carolingian Abbot credited for adding to beer in 822?
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The answer: hops


The problem: Answer a question about this article:
By that time, the majority of black people in the United States were native-born, so the use of the term "African" became problematic. Though initially a source of pride, many blacks feared that the use of African as an identity would be a hindrance to their fight for full citizenship in the US. They also felt that it would give ammunition to those who were advocating repatriating black people back to Africa. In 1835, black leaders called upon Black Americans to remove the title of "African" from their institutions and replace it with "Negro" or "Colored American". A few institutions chose to keep their historic names, such as the African Methodist Episcopal Church. African Americans popularly used the terms "Negro" or "colored" for themselves until the late 1960s.
Why did the use of "African" become an issue?
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The answer:
the majority of black people in the United States were native-born