Problem: The European Revolutions of 1848, known in some countries as the Spring of Nations or the Year of Revolution, were a series of political upheavals throughout the European continent. Described as a revolutionary wave, the period of unrest began in France and then, further propelled by the French Revolution of 1848, soon spread to the rest of Europe. Although most of the revolutions were quickly put down, there was a significant amount of violence in many areas, with tens of thousands of people tortured and killed. While the immediate political effects of the revolutions were reversed, the long-term reverberations of the events were far-reaching.
How many people were estimated to be killed in the revolutions? 
The answer is the following: tens of thousands

Problem: Feynman alludes to his thoughts on the justification for getting involved in the Manhattan project in The Pleasure of Finding Things Out. He felt the possibility of Nazi Germany developing the bomb before the Allies was a compelling reason to help with its development for the U.S. He goes on to say that it was an error on his part not to reconsider the situation once Germany was defeated. In the same publication, Feynman also talks about his worries in the atomic bomb age, feeling for some considerable time that there was a high risk that the bomb would be used again soon, so that it was pointless to build for the future. Later he describes this period as a "depression".
After feeling guilty for helping make an atomic bomb, Feynman went through what mental disorder?
The answer is the following: depression

Problem: Cultural practices in the Americas seem to have been shared mostly within geographical zones where unrelated peoples adopted similar technologies and social organizations. An example of such a cultural area is Mesoamerica, where millennia of coexistence and shared development among the peoples of the region produced a fairly homogeneous culture with complex agricultural and social patterns. Another well-known example is the North American plains where until the 19th century several peoples shared the traits of nomadic hunter-gatherers based primarily on buffalo hunting.
How long was there a homogeneous culture on the North American plains?
The answer is the following: until the 19th century

Problem: Jehovah's Witnesses believe that Jesus is God's only direct creation, that everything else was created by means of Christ, and that the initial unassisted act of creation uniquely identifies Jesus as God's "only-begotten Son". Jesus served as a redeemer and a ransom sacrifice to pay for the sins of humanity. They believe Jesus died on a single upright post rather than the traditional cross. They believe that references in the Bible to the Archangel Michael, Abaddon (Apollyon), and the Word all refer to Jesus. Jesus is considered to be the only intercessor and high priest between God and humanity, and appointed by God as the king and judge of his kingdom. His role as a mediator (referred to in 1 Timothy 2:5) is applied to the 'anointed' class, though the 'other sheep' are said to also benefit from the arrangement.
Who do Jehovah Witnesses believe is God's only direct creation?
The answer is the following:
Jesus