Problem: Dwight D. Eisenhower:

That evening, Eisenhower's body was placed onto a train en route to Abilene, Kansas, the last time a funeral train has been used as part of funeral proceedings of an American president. His body arrived on April 2, and was interred later that day in a small chapel on the grounds of the Eisenhower Presidential Library. The president's body was buried as a General of the Army. The family used an $80 standard soldier's casket, and dressed Eisenhower's body in his famous short green jacket. His only medals worn were: the Army Distinguished Service Medal with three oak leaf clusters, the Navy Distinguished Service Medal, and the Legion of Merit. Eisenhower is buried alongside his son Doud, who died at age 3 in 1921. His wife Mamie was buried next to him after her death in 1979.

What was the cost of Eisenhower's casket?
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A: $80

Problem: It is in this time that the notation of music on a staff and other elements of musical notation began to take shape. This invention made possible the separation of the composition of a piece of music from its transmission; without written music, transmission was oral, and subject to change every time it was transmitted. With a musical score, a work of music could be performed without the composer's presence. The invention of the movable-type printing press in the 15th century had far-reaching consequences on the preservation and transmission of music.
The notation of music on a what began to take shape at this time?
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Answer: staff

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
At the beginning of the Three Kingdoms era (220280 CE), Zhejiang was home to the warlords Yan Baihu and Wang Lang prior to their defeat by Sun Ce and Sun Quan, who eventually established the Kingdom of Wu. Despite the removal of their court from Kuaiji to Jianye (present-day Nanjing), they continued development of the region and benefitted from influxes of refugees fleeing the turmoil in northern China. Industrial kilns were established and trade reached as far as Manchuria and Funan (south Vietnam).
When was the beginning of the Three Kingdoms era?
A: 220280 CE

Context and question: The currentvoltage characteristic of an LED is similar to other diodes, in that the current is dependent exponentially on the voltage (see Shockley diode equation). This means that a small change in voltage can cause a large change in current. If the applied voltage exceeds the LED's forward voltage drop by a small amount, the current rating may be exceeded by a large amount, potentially damaging or destroying the LED. The typical solution is to use constant-current power supplies to keep the current below the LED's maximum current rating. Since most common power sources (batteries, mains) are constant-voltage sources, most LED fixtures must include a power converter, at least a current-limiting resistor. However, the high resistance of three-volt coin cells combined with the high differential resistance of nitride-based LEDs makes it possible to power such an LED from such a coin cell without an external resistor.
What feature do most LED fixtures need to have?
Answer: a power converter

Question: The central oscillator generates a self-sustaining rhythm and is driven by two interacting feedback loops that are active at different times of day. The morning loop consists of CCA1 (Circadian and Clock-Associated 1) and LHY (Late Elongated Hypocotyl), which encode closely related MYB transcription factors that regulate circadian rhythms in Arabidopsis, as well as PRR 7 and 9 (Pseudo-Response Regulators.) The evening loop consists of GI (Gigantea) and ELF4, both involved in regulation of flowering time genes. When CCA1 and LHY are overexpressed (under constant light or dark conditions), plants become arrhythmic, and mRNA signals reduce, contributing to a negative feedback loop. Gene expression of CCA1 and LHY oscillates and peaks in the early morning, whereas TOC1 gene expression oscillates and peaks in the early evening. While it was previously hypothesised that these three genes model a negative feedback loop in which over-expressed CCA1 and LHY repress TOC1 and over-expressed TOC1 is a positive regulator of CCA1 and LHY, it was shown in 2012 by Andrew Millar and others that TOC1 in fact serves as a repressor not only of CCA1, LHY, and PRR7 and 9 in the morning loop but also of GI and ELF4 in the evening loop. This finding and further computational modeling of TOC1 gene functions and interactions suggest a reframing of the plant circadian clock as a triple negative-component repressilator model rather than the positive/negative-element feedback loop characterizing the clock in mammals.
Is there an answer to this question: What produces a self-sustaining rhythm?

Answer: central oscillator

Question: In World War II, the United States, during the Gilbert and Marshall Islands campaign, invaded and occupied the islands in 1944, destroying or isolating the Japanese garrisons. In just one month in 1944, Americans captured Kwajalein Atoll, Majuro and Enewetak, and, in the next two months, the rest of the Marshall Islands, except for Wotje, Mili, Maloelap and Jaluit.
Is there an answer to this question: What was the name of the campaign in which the US occupied the Marshalls?

Answer:
the Gilbert and Marshall Islands campaign