The problem: Answer a question about this article:
During the Gilded Age, there was substantial growth in population in the United States and extravagant displays of wealth and excess of America's upper-class during the post-Civil War and post-Reconstruction era, in the late 19th century. The wealth polarization derived primarily from industrial and population expansion. The businessmen of the Second Industrial Revolution created industrial towns and cities in the Northeast with new factories, and contributed to the creation of an ethnically diverse industrial working class which produced the wealth owned by rising super-rich industrialists and financiers called the "robber barons". An example is the company of John D. Rockefeller, who was an important figure in shaping the new oil industry. Using highly effective tactics and aggressive practices, later widely criticized, Standard Oil absorbed or destroyed most of its competition.
What type of practices did John D. Rockefeller exhibit in the oil industry?
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The answer: effective tactics and aggressive practices

The problem: Answer a question about this article:
The Gospel of Matthew describes many women at the crucifixion, some of whom are named in the Gospels. Apart from these women, the three Synoptic Gospels speak of the presence of others: "the chief priests, with the scribes and elders"; two robbers crucified, one on Jesus' right and one on his left, whom the Gospel of Luke presents as the penitent thief and the impenitent thief; "the soldiers", "the centurion and those who were with him, keeping watch over Jesus"; passers-by; "bystanders", "the crowds that had assembled for this spectacle"; and "his acquaintances"
How many people were crucified with Jesus?
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The answer: two robbers crucified, one on Jesus' right and one on his left

The problem: Answer a question about this article:
Apollo and his sister Artemis can bring death with their arrows. The conception that diseases and death come from invisible shots sent by supernatural beings, or magicians is common in Germanic and Norse mythology. In Greek mythology Artemis was the leader (, "hegemon") of the nymphs, who had similar functions with the Nordic Elves. The "elf-shot" originally indicated disease or death attributed to the elves, but it was later attested denoting stone arrow-heads which were used by witches to harm people, and also for healing rituals.
In Greek mythology, who was the leader of the nymphs?
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The answer: Artemis

The problem: Answer a question about this article:
Two chains of DNA twist around each other to form a DNA double helix with the phosphate-sugar backbone spiralling around the outside, and the bases pointing inwards with adenine base pairing to thymine and guanine to cytosine. The specificity of base pairing occurs because adenine and thymine align form two hydrogen bonds, whereas cytosine and guanine form three hydrogen bonds. The two strands in a double helix must therefore be complementary, with their sequence of bases matching such that the adenines of one strand are paired with the thymines of the other strand, and so on.:4.1
Due to the cause of the specificity of base pairing, what must be true of the two strands in a double helix?
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The answer:
The two strands in a double helix must therefore be complementary