The problem: Answer a question about this article:
Track lighting, invented by Lightolier, was popular at one period of time because it was much easier to install than recessed lighting, and individual fixtures are decorative and can be easily aimed at a wall. It has regained some popularity recently in low-voltage tracks, which often look nothing like their predecessors because they do not have the safety issues that line-voltage systems have, and are therefore less bulky and more ornamental in themselves. A master transformer feeds all of the fixtures on the track or rod with 12 or 24 volts, instead of each light fixture having its own line-to-low voltage transformer. There are traditional spots and floods, as well as other small hanging fixtures. A modified version of this is cable lighting, where lights are hung from or clipped to bare metal cables under tension.
Who invented track lighting?
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The answer: Lightolier

The problem: Answer a question about this article:
Other features of the city's transportation infrastructure encompass more than 12,000 yellow taxicabs; various competing startup transportation network companies; and an aerial tramway that transports commuters between Roosevelt Island and Manhattan Island.
About how many yellow cabs operate in New York?
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The answer: 12,000

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Working closely in conjunction with the definition of the Near East provided by the State Department is the Near East South Asia Center for Strategic Studies (NESA), an educational institution of the United States Department of Defense. It teaches courses and holds seminars and workshops for government officials and military officers who will work or are working within its region. As the name indicates, that region is a combination of State Department regions; however, NESA is careful to identify the State Department region. As its Near East is not different from the State Department's it does not appear in the table. Its name, however, is not entirely accurate. For example, its region includes Mauritania, a member of the State Department's Africa (Sub-Sahara).
What is NESA?
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The answer: an educational institution of the United States Department of Defense

The problem: Answer a question about this article:
The simplest known circadian clock is that of the prokaryotic cyanobacteria. Recent research has demonstrated that the circadian clock of Synechococcus elongatus can be reconstituted in vitro with just the three proteins (KaiA, KaiB, KaiC) of their central oscillator. This clock has been shown to sustain a 22-hour rhythm over several days upon the addition of ATP. Previous explanations of the prokaryotic circadian timekeeper were dependent upon a DNA transcription/translation feedback mechanism.[citation needed]
How long a rhythm were researchers able to sustain in the in vitro experiment?
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The answer:
22-hour