Problem: Slavs:

The word slovo ("word") and the related slava ("fame") and slukh ("hearing") originate from the Proto-Indo-European root *ḱlew- ("be spoken of, fame"), cognate with Ancient Greek κλῆς (klês - "famous"), whence the name Pericles, and Latin clueo ("be called"), and English loud.

What Slavic word means "loud"?
---
A: unanswerable


Problem: Mark Z. Jacobson, professor of civil and environmental engineering at Stanford University and director of its Atmosphere and Energy Program says producing all new energy with wind power, solar power, and hydropower by 2030 is feasible and existing energy supply arrangements could be replaced by 2050. Barriers to implementing the renewable energy plan are seen to be "primarily social and political, not technological or economic". Jacobson says that energy costs with a wind, solar, water system should be similar to today's energy costs.
What is a barrier to implementing the renewable energy plan?
---
Answer: social and political


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
After the fall of Napoleon, not only was Napoleonic Code retained by conquered countries including the Netherlands, Belgium, parts of Italy and Germany, but has been used as the basis of certain parts of law outside Europe including the Dominican Republic, the US state of Louisiana and the Canadian province of Quebec. The memory of Napoleon in Poland is favorable, for his support for independence and opposition to Russia, his legal code, the abolition of serfdom, and the introduction of modern middle class bureaucracies.
After the fall of Napoleon, many countries retained what system of law?
A: Napoleonic Code


Context and question: Switzerland has a stable, prosperous and high-tech economy and enjoys great wealth, being ranked as the wealthiest country in the world per capita in multiple rankings. In 2011 it was ranked as the wealthiest country in the world in per capita terms (with "wealth" being defined to include both financial and non-financial assets), while the 2013 Credit Suisse Global Wealth Report showed that Switzerland was the country with the highest average wealth per adult in 2013. It has the world's nineteenth largest economy by nominal GDP and the thirty-sixth largest by purchasing power parity. It is the twentieth largest exporter, despite its small size. Switzerland has the highest European rating in the Index of Economic Freedom 2010, while also providing large coverage through public services. The nominal per capita GDP is higher than those of the larger Western and Central European economies and Japan. If adjusted for purchasing power parity, Switzerland ranks 8th in the world in terms of GDP per capita, according to the World Bank and IMF (ranked 15th according to the CIA Worldfactbook).
Which rating was assigned to Switzerland by the Index of Economic Freedom of 2010?
Answer: highest European rating


Question: Around 10,200 BC the first fully developed Neolithic cultures belonging to the phase Pre-Pottery Neolithic A (PPNA) appeared in the fertile crescent. Around 10,700 to 9,400 BC a settlement was established in Tell Qaramel, 10 miles north of Aleppo. The settlement included 2 temples dating back to 9,650. Around 9000 BC during the PPNA, one of the world's first towns, Jericho, appeared in the Levant. It was surrounded by a stone and marble wall and contained a population of 2000–3000 people and a massive stone tower. Around 6,400 BC the Halaf culture appeared in Lebanon, Israel and Palestine, Syria, Anatolia, and Northern Mesopotamia and subsisted on dryland agriculture.
Is there an answer to this question: What materials were used to build the wall around PPNA?

Answer: unanswerable


Problem: Geography of the United States:

The Great Basin and Columbia Plateau (the Intermontane Plateaus) are arid or semiarid regions that lie in the rain shadow of the Cascades and Sierra Nevada. Precipitation averages less than 15 inches (38 cm). The Southwest is a hot desert, with temperatures exceeding 100 °F (37.8 °C) for several weeks at a time in summer. The Southwest and the Great Basin are also affected by the monsoon from the Gulf of California from July to September, which brings localized but often severe thunderstorms to the region.

During which months are portions of the US affected by the monsoon from the Gulf of California?
---
A:
July to September