The problem: Answer a question about this article:
Feynman has been called the "Great Explainer". He gained a reputation for taking great care when giving explanations to his students and for making it a moral duty to make the topic accessible. His guiding principle was that, if a topic could not be explained in a freshman lecture, it was not yet fully understood. Feynman gained great pleasure from coming up with such a "freshman-level" explanation, for example, of the connection between spin and statistics. What he said was that groups of particles with spin "repel", whereas groups with integer spin "clump". This was a brilliantly simplified way of demonstrating how FermiDirac statistics and BoseEinstein statistics evolved as a consequence of studying how fermions and bosons behave under a rotation of 360. This was also a question he pondered in his more advanced lectures, and to which he demonstrated the solution in the 1986 Dirac memorial lecture. In the same lecture, he further explained that antiparticles must exist, for if particles had only positive energies, they would not be restricted to a so-called "light cone".
Feynman believed that if a topic was not easily accessible to freshmen than it was not yet what?
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The answer: fully understood

The problem: Answer a question about this article:
On 1 April, Alexander addressed the Senat conservateur. Long docile to Napoleon, under Talleyrand's prodding it had turned against him. Alexander told the Senat that the Allies were fighting against Napoleon, not France, and they were prepared to offer honorable peace terms if Napoleon were removed from power. The next day, the Senat passed the Acte de decheance de l'Empereur ("Emperor's Demise Act"), which declared Napoleon deposed. Napoleon had advanced as far as Fontainebleau when he learned that Paris was lost. When Napoleon proposed the army march on the capital, his senior officers and marshals mutinied. On 4 April, led by Ney, they confronted Napoleon. Napoleon asserted the army would follow him, and Ney replied the army would follow its generals. While the ordinary soldiers and regimental officers wanted to fight on, without any senior officers or marshals any prospective invasion of Paris would have been impossible. Bowing to the inevitable, on 4 April Napoleon abdicated in favour of his son, with Marie-Louise as regent. However, the Allies refused to accept this under prodding from Alexander, who feared that Napoleon might find an excuse to retake the throne. Napoleon was then forced to announce his unconditional abdication only two days later.
What did Napoleon's senior officers and marshals do when he suggested they march on Paris?
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The answer: mutinied

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The fortified city temporarily fell to the French invasion in 1672 (the Disaster Year); where the French invasion was only stopped west of Utrecht at the Old Hollandic Waterline. In 1674, only two years after the French left, the centre of Utrecht was struck by a tornado. The halt to building before construction of flying buttresses in the 15th century now proved to be the undoing of the central section of the cathedral of St Martin church which collapsed; creating the current Dom square between the tower and choir. In 1713, Utrecht hosted one of the first international peace negotiations when the Treaty of Utrecht settled the War of the Spanish Succession. Since 1723 Utrecht became the centre of the non-Roman Old Catholic Churches in the world.
Who did the fortified city fall to in 1672
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The answer: temporarily fell to the French invasion in 1672 (the Disaster Year); where the French invasion was only stopped west of Utrecht

The problem: Answer a question about this article:
Larry Heard, a.k.a. "Mr. Fingers", claims that the term "house" became popular due to many of the early DJs creating music in their own homes using synthesizers and drum machines such as the Roland TR-808, TR-909, and the TB 303.[citation needed] These synthesizers were used to create a house subgenre called acid house.
Why did the term house become popular?
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The answer:
early DJs creating music in their own homes