Problem: To create green sparks, fireworks use barium salts, such as barium chlorate, barium nitrate crystals, or barium chloride, also used for green fireplace logs. Copper salts typically burn blue, but cupric chloride (also known as "campfire blue") can also produce green flames. Green pyrotechnic flares can use a mix ratio 75:25 of boron and potassium nitrate. Smoke can be turned green by a mixture: solvent yellow 33, solvent green 3, lactose, magnesium carbonate plus sodium carbonate added to potassium chlorate.
What type of copper salts are used in fireworks?
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Answer: unanswerable

Problem: The Free Officers' intention was not to install themselves in government, but to re-establish a parliamentary democracy. Nasser did not believe that a low-ranking officer like himself (a lieutenant colonel) would be accepted by the Egyptian people, and so selected General Naguib to be his "boss" and lead the coup in name. The revolution they had long sought was launched on 22 July and was declared a success the next day. The Free Officers seized control of all government buildings, radio stations, and police stations, as well as army headquarters in Cairo. While many of the rebel officers were leading their units, Nasser donned civilian clothing to avoid detection by royalists and moved around Cairo monitoring the situation. In a move to stave off foreign intervention two days before the revolution, Nasser had notified the American and British governments of his intentions, and both had agreed not to aid Farouk. Under pressure from the Americans, Nasser had agreed to exile the deposed king with an honorary ceremony.
What type of government did the Free Officer's want to establish?
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Answer: parliamentary democracy

Problem: The top 10 contestants started with five males and five females, however, the males were eliminated consecutively in the first five weeks, with Lazaro Arbos the last male to be eliminated. For the first time in the show's history, the top 5 contestants were all female. It was also the first time that the judges' "save" was not used, the top four contestants were therefore given an extra week to perform again with their votes carried over with no elimination in the first week.
How many contestants were able to perform for two weeks without any eliminations?
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Answer:
four