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In the Soviet Union, in the 1970s, a comparison was made between systems electrified at 3 kV DC and 25 kV AC (50 Hz). The results showed that percentage losses in the overhead wires (catenary and contact wires) was over 3 times greater for 3 kV DC than for 25 kV AC. But when the conversion losses were all taken into account and added to overhead wire losses (including cooling blower energy) the 25 kV AC lost a somewhat higher percent of energy than for 3 kV DC. Thus in spite of the much higher losses in the catenary, the 3 kV DC was a little more energy efficient than AC in providing energy from the USSR power grid to the terminals of the traction motors (all DC at that time). While both systems use energy in converting higher voltage AC from the USSR's power grid to lower voltage DC, the conversions for the DC system all took place (at higher efficiency) in the railway substation, while most of the conversion for the AC system took place inside the locomotive (at lower efficiency). Consider also that it takes energy to constantly move this mobile conversion hardware over the rails while the stationary hardware in the railway substation doesn't incur this energy cost. For more details see: Wiki: Soviet Union DC vs. AC.
What two systems were compare in the Soviet Union in 1970?
A: 3 kV DC and 25 kV AC (50 Hz

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Despite the internal stability (known as the paz porfiriana), modernization, and economic growth in Mexico during the Porfiriato from 1876 to 1910, many across the state became deeply dissatisfied with the political system. When Díaz first ran for office, he committed to a strict “No Re-election” policy in which he disqualified himself to serve consecutive terms. Eventually backtracking on many of his initial political positions Díaz became a de facto dictator. Díaz became increasingly unpopular due to brutal suppression of political dissidents by using the Rurales and manipulating the elections to solidify his political machine. The working class was frustrated with the Díaz regime due to the corruption of the political system that had increased the inequality between the rich and poor. The peasants felt disenfranchised by the policies that promoted the unfair distribution of land where 95% of the land was owned by the top 5%.
Who committed to a strict "No Re-election" policy when running for office?
A: Díaz

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Yongzheng also inherited diplomatic and strategic problems. A team made up entirely of Manchus drew up the Treaty of Kyakhta (1727) to solidify the diplomatic understanding with Russia. In exchange for territory and trading rights, the Qing would have a free hand dealing with the situation in Mongolia. Yongzheng then turned to that situation, where the Zunghars threatened to re-emerge, and to the southwest, where local Miao chieftains resisted Qing expansion. These campaigns drained the treasury but established the emperor's control of the military and military finance.
Who was the partner in the Treaty of Kyakhta?
A: Russia

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In Latin, papyri from Herculaneum dating before 79 AD (when it was destroyed) have been found that have been written in old Roman cursive, where the early forms of minuscule letters "d", "h" and "r", for example, can already be recognised. According to papyrologist Knut Kleve, "The theory, then, that the lower-case letters have been developed from the fifth century uncials and the ninth century Carolingian minuscules seems to be wrong." Both majuscule and minuscule letters existed, but the difference between the two variants was initially stylistic rather than orthographic and the writing system was still basically unicameral: a given handwritten document could use either one style or the other but these were not mixed. European languages, except for Ancient Greek and Latin, did not make the case distinction before about 1300.[citation needed]
What was the initial difference between majuscule and minuscule letters? 
A:
stylistic