Input: The inhabited history of the Las Vegas Valley stretches to 23,000 b.c. , when much of the area was covered by a prehistoric lake. During this period, the indigenous people lived in caves, hunting the mammals that gathered at the shoreline. The landscape of the valley changed dramatically over the next 200 centuries. The glaciers feeding the lake melted away and the lake evaporated. Fossils tell an obscure story of man's slow and sporadic development. Around 3000 b.c. , native Archaic Indians began to develop a lasting hunting and gathering culture. By this time, the valley was in much the same geographic state as it exists in today, with one exceptionthe presence of artesian springs that bubbled to the surface in several areas. These springs fed a network of streams draining through the Las Vegas Wash to the Colorado River. The areas surrounding the springs were desert oases: sprawling collections of grasses, trees, and wildlife. Many springs lay in areas that would eventually become the center of the modern Las Vegas metropolis. For about 4000 years, the Archaics thrived in a culture that included many signs of early civilization. Signs of even more advancement appeared halfway through the first millennium a.d. , when the Anasazi Indians inhabited the valley. Far more progressive than the Archaics, the Anasazi utilized such formal agricultural techniques as irrigation to assist their harvest. This permitted the Anasazi to achieve a benchmark of advanced societythe ability to live in permanent shelters year-round without need to follow wildlife. Mysteriously, the Anasazi vanished from the valley around a.d.
"Where did the Anasazi live?" is "Caves"?

OPTIONS:
- no
- yes
Output: no

Input: You may be wondering, how can a glacier get so big? Why does it move? These are both good questions. In the winter months, precipitation falls as snow. This solid form of water builds up on the ground as long as the temperatures stay cold enough. As the temperature rises, the snow starts to melt. The frozen water changes state back into a liquid state. Nearer the poles, summer does not last very long. If the summer is long enough and warm enough, all the snow may melt. This is what typically happens now. The earth was a little cooler 12,000 years ago. As a result, during the summer months, that amount of snow did not melt. It may have only been an inch or so of snow that melted. The following winter, snow fell on top of this left-over snow. This next winters snowfall had a head start. Year after year, the snow that did not melt became thicker and thicker. Inch by inch the snow started to build up. Over many years, layer upon layer of snow compacted and turned to ice.

Does the response "Temperatures rise and fall depending on the time of year" correctly answer the question "Are temps always the same in glacier areas?"?

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- no
- yes
***
Output: yes

You know that friction also causes heat. Think about when you rub your hands together. It is friction that makes them warm. But why does this happen? Friction causes the molecules on rubbing surfaces to move faster. Faster moving particles have more heat energy. Heat from friction can be useful. Can you think of other places where you might find friction? Friction also lets you light a match. Heat from friction can also cause problems. It can cause a car to overheat. To reduce friction, oil is added to the engine. Oil coats the surfaces of moving parts. This coating of oil makes them slippery. When things are slippery there is less friction. Have you ever seen a sign that says, slippery when wet? This too has to do with friction. Water, like oil, can reduce friction. The wet surface may allow your shoes to slide more easily.

Question: "What can be done to prevent friction problems in engines?"

OPTIONS:
- no
- yes

Answer: "Water is added to the engine"

Response: no

Problem: These experiments in political Islam faltered during the 1990s: the Iranian revolution lost momentum, prestige, and public support, and Pakistan's rulers found that most of its population had little enthusiasm for fundamentalist Islam. Islamist revival movements gained followers across the Muslim world, but failed to secure political power except in Iran and Sudan. In Algeria, where in 1991 Islamists seemed almost certain to win power through the ballot box, the military preempted their victory, triggering a brutal civil war that continues today. Opponents of today's rulers have few, if any, ways to participate in the existing political system. They are thus a ready audience for calls to Muslims to purify their society, reject unwelcome modernization, and adhere strictly to the Sharia. Social and Economic Malaise In the 1970s and early 1980s, an unprecedented flood of wealth led the then largely unmodernized oil states to attempt to shortcut decades of development. They funded huge infrastructure projects, vastly expanded education, and created subsidized social welfare programs. These programs established a widespread feeling of entitlement without a corresponding sense of social obligations. By the late 1980s, diminishing oil revenues, the economic drain from many unprofitable development projects, and population growth made these entitlement programs unsustainable. The resulting cutbacks created enormous resentment among recipients who had come to see government largesse as their right. This resentment was further stoked by public understanding of how much oil income had gone straight into the pockets of the rulers, their friends, and their helpers. Unlike the oil states (or Afghanistan, where real economic development has barely begun), the other Arab nations and Pakistan once had seemed headed toward balanced modernization. The established commercial, financial, and industrial sectors in these states, supported by an entrepreneurial spirit and widespread understanding of free enterprise, augured well. But unprofitable heavy industry, state monopolies, and opaque bureaucracies slowly stifled growth. More importantly, these state-centered regimes placed their highest priority on preserving the elite's grip on national wealth. Unwilling to foster dynamic economies that could create jobs attractive to educated young men, the countries became economically stagnant and reliant on the safety valve of worker emigration either to the Arab oil states or to the West. Furthermore, the repression and isolation of women in many Muslim countries have not only seriously limited individual opportunity but also crippled overall economic productivity. By the 1990s, high birthrates and declining rates of infant mortality had produced a common problem throughout the Muslim world: a large, steadily increasing population of young men without any reasonable expectation of suitable or steady employment-a sure prescription for social turbulence.

Question: "What year did high birthrates and declining rates of infant mortality begin?"

Answer: "1990's; the repression and isolation of women in many Muslim countries crippled overall economic productivity"

OPTIONS:
- no
- yes
Answer:
yes