Here is a question about this article: According to some historians, Bismarck adroitly created a diplomatic crisis over the succession to the Spanish throne, then edited a dispatch about a meeting between King William of Prussia and the French ambassador, to make it appear that the French had been insulted. The French press and parliament demanded a war, which the generals of Napoleon III assured him that France would win. Napoleon and his Prime Minister, Émile Ollivier, for their parts sought war to solve their problems with political disunity in France. On 16 July 1870, the French parliament voted to declare war on the German Kingdom of Prussia and hostilities began three days later. The German coalition mobilised its troops much more quickly than the French and rapidly invaded northeastern France. The German forces were superior in numbers, had better training and leadership and made more effective use of modern technology, particularly railroads and artillery.
What is the answer to this question: What diplomatic crisis was Bismarck credited with skillfully creating? 
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So... succession to the Spanish throne


Here is a question about this article: Britain's first use of brass occurred around the 3rd–2nd century BC. In North America, copper mining began with marginal workings by Native Americans. Native copper is known to have been extracted from sites on Isle Royale with primitive stone tools between 800 and 1600. Copper metallurgy was flourishing in South America, particularly in Peru around 1000 AD; it proceeded at a much slower rate on other continents. Copper burial ornamentals from the 15th century have been uncovered, but the metal's commercial production did not start until the early 20th century.
What is the answer to this question: Who were the first copper miners in North America?
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So... Native Americans


Here is a question about this article: Providing sufficient base drive current is a key problem in the use of bipolar transistors as switches. The transistor provides current gain, allowing a relatively large current in the collector to be switched by a much smaller current into the base terminal. The ratio of these currents varies depending on the type of transistor, and even for a particular type, varies depending on the collector current. In the example light-switch circuit shown, the resistor is chosen to provide enough base current to ensure the transistor will be saturated.
What is the answer to this question: What determines the current ratio in transistors?
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So...
the type of transistor