Problem: Thuringia:

The name Thuringia or Thuringen derives from the Germanic tribe Thuringii, who emerged during the Migration Period. Their origin is not completely known. An older theory claimed that they were successors of the Hermunduri, but later research rejected the idea. Other historians argue that the Thuringians were allies of the Huns, came to central Europe together with them, and lived before in what is Galicia today. Publius Flavius Vegetius Renatus first mentioned the Thuringii around 400; during that period, the Thuringii were famous for their excellent horses.

When were the Thuringii last mentioned?
---
A: unanswerable

Problem: Muammar Gaddafi:

Following his ascension to power, Gaddafi moved into the Bab al-Azizia barracks, a six-mile long fortified compound located two miles from the center of Tripoli. His home and office at Azizia was a bunker designed by West German engineers, while the rest of his family lived in a large two-story building. Within the compound were also two tennis courts, a soccer field, several gardens, camels, and a Bedouin tent in which he entertained guests. In the 1980s, his lifestyle was considered modest in comparison to those of many other Arab leaders. Gaddafi allegedly worked for years with Swiss banks to launder international banking transactions. In November 2011, The Sunday Times identified property worth 1 billion in the UK that Gaddafi allegedly owned. Gaddafi had an Airbus A340 private jet, which he bought from Prince Al-Waleed bin Talal of Saudi Arabia for $120 million in 2003. Operated by Tripoli-based Afriqiyah Airways and decorated externally in their colours, it had various luxuries including a jacuzzi.

Who designed Gaddafi's Azizia home?
---
A: West German engineers

Problem: Rajasthan:

Spirit possession has been documented in modern Rajasthan. Some of the spirits possessing Rajasthanis are seen as good and beneficial while others are seen as malevolent. The good spirits include murdered royalty, the underworld god Bhaironji, and Muslim saints. Bad spirits include perpetual debtors who die in debt, stillborn infants, deceased widows, and foreign tourists. The possessed individual is referred to as a ghorala ("mount"). Possession, even if it is by a benign spirit, is regarded as undesirable, as it entails loss of self-control and violent emotional outbursts.

What underworld god posesses Muslim saints?
---
A: unanswerable

Problem: Solar energy:

The Earth receives 174,000 terawatts (TW) of incoming solar radiation (insolation) at the upper atmosphere. Approximately 30% is reflected back to space while the rest is absorbed by clouds, oceans and land masses. The spectrum of solar light at the Earth's surface is mostly spread across the visible and near-infrared ranges with a small part in the near-ultraviolet. Most people around the world live in areas with insolation levels of 150 to 300 watts per square meter or 3.5 to 7.0 kWh/m2 per day.

What are the insolation levels of most populated areas?
---
A:
150 to 300 watts per square meter or 3.5 to 7.0 kWh/m2 per day