The problem: Answer a question about this article:
Like any plucked instrument, mandolin notes decay to silence rather than sound out continuously as with a bowed note on a violin, and mandolin notes decay faster than larger stringed instruments like the guitar. This encourages the use of tremolo (rapid picking of one or more pairs of strings) to create sustained notes or chords. The mandolin's paired strings facilitate this technique: the plectrum (pick) strikes each of a pair of strings alternately, providing a more full and continuous sound than a single string would.
What is a plectrum?
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The answer: pick

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In the United States, federalism originally referred to belief in a stronger central government. When the U.S. Constitution was being drafted, the Federalist Party supported a stronger central government, while "Anti-Federalists" wanted a weaker central government. This is very different from the modern usage of "federalism" in Europe and the United States. The distinction stems from the fact that "federalism" is situated in the middle of the political spectrum between a confederacy and a unitary state. The U.S. Constitution was written as a reaction to the Articles of Confederation, under which the United States was a loose confederation with a weak central government.
In the United States, what was federalism referred to?
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The answer: belief in a stronger central government.

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During the fighting, the Communards killed c.500 people, including the Archbishop of Paris, and burned down many government buildings, including the Tuileries Palace and the Hotel de Ville. Communards captured with weapons were routinely shot by the army and Government troops killed from 7,00030,000 Communards in the fighting and in massacres of men, women, and children during and after the Commune. More recent histories, based on studies of the number buried in Paris cemeteries and in mass graves after the fall of the Commune, put the number killed at between 6,000 and 10,000. Twenty-six courts were established to try more than 40,000 people who had been arrested, which took until 1875 and imposed 95 death sentences, of which 23 were inflicted. Forced labour for life was imposed on 251 people, 1,160 people were transported to "a fortified place" and 3,417 people were transported. About 20,000 Communards were held in prison hulks until released in 1872 and a great many Communards fled abroad to England, Switzerland, Belgium or the United States. The survivors were amnestied by a bill introduced by Gambetta in 1880 and allowed to return.
How many were killed by the Communards?
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The answer: 500 people

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There were serious scientific objections to the process of natural selection as the key mechanism of evolution, including Karl von Nageli's insistence that a trivial characteristic with no adaptive advantage could not be developed by selection. Darwin conceded that these could be linked to adaptive characteristics. His estimate that the age of the Earth allowed gradual evolution was disputed by William Thomson (later awarded the title Lord Kelvin), who calculated that it had cooled in less than 100 million years. Darwin accepted blending inheritance, but Fleeming Jenkin calculated that as it mixed traits, natural selection could not accumulate useful traits. Darwin tried to meet these objections in the 5th edition. Mivart supported directed evolution, and compiled scientific and religious objections to natural selection. In response, Darwin made considerable changes to the sixth edition. The problems of the age of the Earth and heredity were only resolved in the 20th century.
Who disputed Darwin's estimate that the age of the earth allowed gradual evolution of species?
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The answer:
William Thomson