The problem: Answer a question about this article:
Praca dos Tres Poderes (Portuguese for Square of the Three Powers) is a plaza in Brasilia. The name is derived from the encounter of the three federal branches around the plaza: the Executive, represented by the Palacio do Planalto (presidential office); the Legislative, represented by the National Congress (Congresso Nacional); and the Judicial branch, represented by the Supreme Federal Court (Supremo Tribunal Federal). It is a tourist attraction in Brasilia, designed by Lucio Costa and Oscar Niemeyer as a place where the three branches would meet harmoniously.
Who designed the Praca dos Tres Poderes?
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The answer: Lucio Costa and Oscar Niemeyer

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Neurotransmitters are chemicals that are released at synapses when an action potential activates themneurotransmitters attach themselves to receptor molecules on the membrane of the synapse's target cell, and thereby alter the electrical or chemical properties of the receptor molecules. With few exceptions, each neuron in the brain releases the same chemical neurotransmitter, or combination of neurotransmitters, at all the synaptic connections it makes with other neurons; this rule is known as Dale's principle. Thus, a neuron can be characterized by the neurotransmitters that it releases. The great majority of psychoactive drugs exert their effects by altering specific neurotransmitter systems. This applies to drugs such as cannabinoids, nicotine, heroin, cocaine, alcohol, fluoxetine, chlorpromazine, and many others.
Neurons that release the same chemicals are following what rule?
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The answer: Dale's principle

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Part of the Haunted Mansion attraction at Disneyland in Anaheim, California, and Disneyland in Paris, France, takes place on an elevator. The "stretching room" on the ride is actually an elevator that travels downwards, giving access to a short underground tunnel which leads to the rest of the attraction. The elevator has no ceiling and its shaft is decorated to look like walls of a mansion. Because there is no roof, passengers are able to see the walls of the shaft by looking up, which gives the illusion of the room stretching.
The Haunted Mansion at Disneyland in California and the one in Paris, France sharewhat attribute?
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The answer: takes place on an elevator

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The major applications of copper are in electrical wires (60%), roofing and plumbing (20%) and industrial machinery (15%). Copper is mostly used as a pure metal, but when a higher hardness is required it is combined with other elements to make an alloy (5% of total use) such as brass and bronze. A small part of copper supply is used in production of compounds for nutritional supplements and fungicides in agriculture. Machining of copper is possible, although it is usually necessary to use an alloy for intricate parts to get good machinability characteristics.
What is a metal that copper is combined with to create a greater hardness?
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The answer:
brass