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This means that a 5% reduction in operating voltage will more than double the life of the bulb, at the expense of reducing its light output by about 16%. This may be a very acceptable trade off for a light bulb that is in a difficult-to-access location (for example, traffic lights or fixtures hung from high ceilings). Long-life bulbs take advantage of this trade-off. Since the value of the electric power they consume is much more than the value of the lamp, general service lamps emphasize efficiency over long operating life. The objective is to minimize the cost of light, not the cost of lamps. Early bulbs had a life of up to 2500 hours, but in 1924 a cartel agreed to limit life to 1000 hours. When this was exposed in 1953, General Electric and other leading American manufacturers were banned from limiting the life.

When did light bulb manufacturers establish a cartel to limit bulb life?
Answer: 1924
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Greece played a peripheral role in the war. When Russia attacked the Ottoman Empire in 1853, King Otto of Greece saw an opportunity to expand North and South into Ottoman areas that had large Greek Christian majorities. However, Greece did not coordinate its plans with Russia, did not declare war, and received no outside military or financial support. Greece, an Orthodox nation, had considerable support in Russia, but the Russian government decided it was too dangerous to help Greece expand its holdings.:3240 When the Russians invaded the Principalities, the Ottoman forces were tied down so Greece invaded Thessaly and Epirus. To block further Greek moves, the British and French occupied the main Greek port at Piraeus from April 1854 to February 1857, and effectively neutralized the Greek army. Greeks, gambling on a Russian victory, incited the large-scale Epirus Revolt of 1854 as well as uprisings in Crete. The insurrections were failures that were easily crushed by the Ottoman army. Greece was not invited to the peace conference and made no gains out of the war.:139 The frustrated Greek leadership blamed the King for failing to take advantage of the situation; his popularity plunged and he was later forced to abdicate.

From April 1854 to February 1857, what port did the British and French lock down?
Answer: Greek port at Piraeus
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In June, Truman became the first president to address the NAACP. His speech was a significant departure from traditional race relations in the United States. In front of 10,000 people at the Lincoln Memorial, the president left no doubt where he stood on civil rights. According to his speech, America had "reached a turning point in the long history of our country's efforts to guarantee freedom and equality to all our citizensEach man must be guaranteed equality of opportunity." He proposed what black citizens had been calling for - an enhanced role of federal authority through the states. "We must make the Federal government a friendly, vigilant defender of the rights and equalities of all Americans. And again I mean all Americans.":40

How many people were present at the speech that Truman made?
Answer:
10,000