Problem: This was followed by the creation of the first two Han Banners in 1637 (increasing to eight in 1642). Together these military reforms enabled Hong Taiji to resoundingly defeat Ming forces in a series of battles from 1640 to 1642 for the territories of Songshan and Jinzhou. This final victory resulted in the surrender of many of the Ming dynasty's most battle-hardened troops, the death of Yuan Chonghuan at the hands of the Chongzhen Emperor (who thought Yuan had betrayed him), and the complete and permanent withdrawal of the remaining Ming forces north of the Great Wall.
Where did the Ming armies retreat to?
The answer is the following: north of the Great Wall


It has pleased western historians to write of a decline of the Ottoman Empire as though a stable and uncontested polity of that name once existed. The borders did expand and contract but they were always dynamic and always in "question" right from the beginning. The Ottoman Empire was created from the lands of the former eastern Roman Empire on the occasion of the latter's violent demise. The last Roman emperor died fighting hand-to-hand in the streets of his capital, Constantinople, overwhelmed by the Ottoman military, in May, 1453. The victors inherited his remaining territory in the Balkans.
What was the Ottoman Empire created from?
the lands of the former eastern Roman Empire


Input: Franco-Prussian War
On the French side, planning after the disaster at Wissembourg had become essential. General Le Bœuf, flushed with anger, was intent upon going on the offensive over the Saar and countering their loss. However, planning for the next encounter was more based upon the reality of unfolding events rather than emotion or pride, as Intendant General Wolff told him and his staff that supply beyond the Saar would be impossible. Therefore, the armies of France would take up a defensive position that would protect against every possible attack point, but also left the armies unable to support each other.

Which disaster made French planning supremely essential?
Output: the disaster at Wissembourg


Input: Article: The light from LEDs can be modulated very quickly so they are used extensively in optical fiber and free space optics communications. This includes remote controls, such as for TVs, VCRs, and LED Computers, where infrared LEDs are often used. Opto-isolators use an LED combined with a photodiode or phototransistor to provide a signal path with electrical isolation between two circuits. This is especially useful in medical equipment where the signals from a low-voltage sensor circuit (usually battery-powered) in contact with a living organism must be electrically isolated from any possible electrical failure in a recording or monitoring device operating at potentially dangerous voltages. An optoisolator also allows information to be transferred between circuits not sharing a common ground potential.

Now answer this question: Where are LEDs often used?

Output: free space optics communications


Article: The first polytechnic in Hong Kong is The Hong Kong Polytechnic, established in 1972 through upgrading the Hong Kong Technical College (Government Trade School before 1947). The second polytechnic, the City Polytechnic of Hong Kong, was founded in 1984. These polytechnics awards diplomas, higher diplomas, as well as academic degrees. Like the United Kingdom, the two polytechnics were granted university status in 1994, and renamed The Hong Kong Polytechnic University and the City University of Hong Kong respectively. The Hong Kong University of Science and Technology, a university with a focus in applied science, engineering and business, was founded in 1991.

Question: In what year was the City Polytechnic of Hong Kong founded?
Ans: 1984


Input: Emotion
Based on discoveries made through neural mapping of the limbic system, the neurobiological explanation of human emotion is that emotion is a pleasant or unpleasant mental state organized in the limbic system of the mammalian brain. If distinguished from reactive responses of reptiles, emotions would then be mammalian elaborations of general vertebrate arousal patterns, in which neurochemicals (for example, dopamine, noradrenaline, and serotonin) step-up or step-down the brain's activity level, as visible in body movements, gestures and postures. Emotions can likely be mediated by pheromones (see fear).

What classification of chemicals do dopamine, serotonin and noradrenaline belong to?
Output:
neurochemicals