Problem: Early research into circadian rhythms suggested that most people preferred a day closer to 25 hours when isolated from external stimuli like daylight and timekeeping. However, this research was faulty because it failed to shield the participants from artificial light. Although subjects were shielded from time cues (like clocks) and daylight, the researchers were not aware of the phase-delaying effects of indoor electric lights.[dubious discuss] The subjects were allowed to turn on light when they were awake and to turn it off when they wanted to sleep. Electric light in the evening delayed their circadian phase.[citation needed] A more stringent study conducted in 1999 by Harvard University estimated the natural human rhythm to be closer to 24 hours, 11 minutes: much closer to the solar day but still not perfectly in sync.
What did electric lighting in the evening do to the test subjects circadian phase?
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Answer: delayed

Problem: About 5% of the Nicaraguan population are indigenous. The largest indigenous group in Nicaragua is the Miskito people. Their territory extended from Cape Camaron, Honduras, to Rio Grande, Nicaragua along the Mosquito Coast. There is a native Miskito language, but large groups speak Miskito Coast Creole, Spanish, Rama and other languages. The Creole English came about through frequent contact with the British who colonized the area. Many are Christians. Traditional Miskito society was highly structured with a defined political structure. There was a king, but he did not have total power. Instead, the power was split between himself, a governor, a general, and by the 1750s, an admiral. Historical information on kings is often obscured by the fact that many of the kings were semi-mythical. Another major group is the Mayangna (or Sumu) people, counting some 10,000 people.
What percentage of the Nicaraguan population are indigenous?
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Answer: About 5%

Problem: In many situations it is desirable to consider two group elements the same if they differ by an element of a given subgroup. For example, in D4 above, once a reflection is performed, the square never gets back to the r2 configuration by just applying the rotation operations (and no further reflections), i.e. the rotation operations are irrelevant to the question whether a reflection has been performed. Cosets are used to formalize this insight: a subgroup H defines left and right cosets, which can be thought of as translations of H by arbitrary group elements g. In symbolic terms, the left and right cosets of H containing g are
When are rotation operations considered?
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Answer:
unanswerable