Article: LEDs have been developed by Seoul Semiconductor that can operate on AC power without the need for a DC converter. For each half-cycle, part of the LED emits light and part is dark, and this is reversed during the next half-cycle. The efficacy of this type of HP-LED is typically 40 lm/W. A large number of LED elements in series may be able to operate directly from line voltage. In 2009, Seoul Semiconductor released a high DC voltage LED, named as 'Acrich MJT', capable of being driven from AC power with a simple controlling circuit. The low-power dissipation of these LEDs affords them more flexibility than the original AC LED design.

Question: What company has developed LEDs that can operate on AC power?
Ans: Seoul Semiconductor


Here is a question about this article: The United Nations estimates that the population in 2009 was at 154,729,000, distributed as 51.7% rural and 48.3% urban, and with a population density of 167.5 people per square kilometre. National census results in the past few decades have been disputed. The results of the most recent census were released in December 2006 and gave a population of 140,003,542. The only breakdown available was by gender: males numbered 71,709,859, females numbered 68,293,08. On June 2012, President Goodluck Jonathan said that Nigerians should limit their number of children.
What is the answer to this question: How much of Nigeria's population in 2009 was rural?
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So... 51.7%


The problem: Answer a question about this article:
Israeli cuisine has adopted, and continues to adapt, elements of various styles of Jewish cuisine, particularly the Mizrahi, Sephardic, and Ashkenazi styles of cooking, along with Moroccan Jewish, Iraqi Jewish, Ethiopian Jewish, Indian Jewish, Iranian Jewish and Yemeni Jewish influences. It incorporates many foods traditionally eaten in the Arab, Middle Eastern and Mediterranean cuisines, such as falafel, hummus, shakshouka, couscous, and za'atar, which have become common ingredients in Israeli cuisine. Schnitzel, pizza, hamburgers, French fries, rice and salad are also very common in Israel.[citation needed]
What common ingredients are in Israeli cuisine?
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The answer: falafel, hummus, shakshouka, couscous, and za'atar


Problem: Please answer a question about the following article about Mesozoic:
The dominant land plant species of the time were gymnosperms, which are vascular, cone-bearing, non-flowering plants such as conifers that produce seeds without a coating. This is opposed to the earth's current flora, in which the dominant land plants in terms of number of species are angiosperms. One particular plant genus, Ginkgo, is thought to have evolved at this time and is represented today by a single species, Ginkgo biloba. As well, the extant genus Sequoia is believed to have evolved in the Mesozoic.
When did the Ginkgo evolve?
A: Mesozoic


Question: Read this and answer the question

Magnates often received gifts from monarchs, which significantly increased their wealth. Often, those gifts were only temporary leases, which the magnates never returned (in the 16th century, the anti-magnate opposition among szlachta was known as the ruch egzekucji praw—movement for execution of the laws—which demanded that all such possessions are returned to their proper owner, the king).

Magnates recieved gifts often from who?
Answer: monarchs


Wever argued that the Luftwaffe General Staff should not be solely educated in tactical and operational matters. He argued they should be educated in grand strategy, war economics, armament production, and the mentality of potential opponents (also known as mirror imaging). Wever's vision was not realised; the General Staff studies in those subjects fell by the wayside, and the Air Academies focused on tactics, technology, and operational planning, rather than on independent strategic air offensives.
What army does the general staff belong to?
the Luftwaffe