Problem: Red:

Red was the color of the banner of the Byzantine emperors. In Western Europe, Emperor Charlemagne painted his palace red as a very visible symbol of his authority, and wore red shoes at his coronation. Kings, princes and, beginning in 1295, Roman Catholic cardinals began to wear red costumes. When Abbe Suger rebuilt Saint Denis Basilica outside Paris in the early 12th century, he added stained glass windows colored blue cobalt glass and red glass tinted with copper. Together they flooded the basilica with a mystical light. Soon stained glass windows were being added to cathedrals all across France, England and Germany. In Medieval painting red was used to attract attention to the most important figures; both Christ and the Virgin Mary were commonly painted wearing red mantles.

Who rebuilt the basilica of Saint Denis?
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A: Abbe Suger

Problem: Light-emitting diode:

Quantum dots (QD) are semiconductor nanocrystals that possess unique optical properties. Their emission color can be tuned from the visible throughout the infrared spectrum. This allows quantum dot LEDs to create almost any color on the CIE diagram. This provides more color options and better color rendering than white LEDs since the emission spectrum is much narrower, characteristic of quantum confined states. There are two types of schemes for QD excitation. One uses photo excitation with a primary light source LED (typically blue or UV LEDs are used). The other is direct electrical excitation first demonstrated by Alivisatos et al.

What nanocrystals possess unique optical properties?
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A: Quantum dots

Problem: History of India:

Bal Gangadhar Tilak, an Indian nationalist leader, declared Swaraj as the destiny of the nation. His popular sentence "Swaraj is my birthright, and I shall have it" became the source of inspiration for Indians. Tilak was backed by rising public leaders like Bipin Chandra Pal and Lala Lajpat Rai, who held the same point of view. Under them, India's three big provinces Maharashtra, Bengal and Punjab, India shaped the demand of the people and India's nationalism. In 1907, the Congress was split into two factions: The radicals, led by Tilak, advocated civil agitation and direct revolution to overthrow the British Empire and the abandonment of all things British. The moderates, led by leaders like Dadabhai Naoroji and Gopal Krishna Gokhale, on the other hand wanted reform within the framework of British rule.

Which faction wanted reform within British rule?
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A: The moderates

Problem: Crimean War:

In the west, the Russians were dissuaded from attacking Vidin by the presence of the Austrian forces, which had swelled to 280,000 men. On 28 May 1854 a protocol of the Vienna Conference was signed by Austria and Russia. One of the aims of the Russian advance had been to encourage the Orthodox Christian Serbs and Bulgarians living under Ottoman rule to rebel. However, when the Russian troops actually crossed the River Pruth into Moldavia, the Orthodox Christians still showed no interest in rising up against the Turks.:131, 137 Adding to the worries of Nicholas I was the concern that Austria would enter the war against the Russians and attack his armies on the western flank. Indeed, after attempting to mediate a peaceful settlement between Russia and Turkey, the Austrians entered the war on the side of Turkey with an attack against the Russians in the Principalities which threatened to cut off the Russian supply lines. Accordingly, the Russians were forced to raise the siege of Silistra on 23 June 1854, and begin abandoning the Principalities.:185 The lifting of the siege reduced the threat of a Russian advance into Bulgaria.

How man men did the Austrian forces have when stopping the attack on Vidin?
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A:
280,000