Problem: Vacuum:

In general relativity, a vanishing stress-energy tensor implies, through Einstein field equations, the vanishing of all the components of the Ricci tensor. Vacuum does not mean that the curvature of space-time is necessarily flat: the gravitational field can still produce curvature in a vacuum in the form of tidal forces and gravitational waves (technically, these phenomena are the components of the Weyl tensor). The black hole (with zero electric charge) is an elegant example of a region completely "filled" with vacuum, but still showing a strong curvature.

What kind of electric charge does a vanishing stress-energy tensor have?
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A: unanswerable


Problem: The Kushan Empire expanded out of what is now Afghanistan into the northwest of the subcontinent under the leadership of their first emperor, Kujula Kadphises, about the middle of the 1st century CE. They came of an Indo-European language speaking Central Asian tribe called the Yuezhi, a branch of which was known as the Kushans. By the time of his grandson, Kanishka, they had conquered most of northern India, at least as far as Saketa and Pataliputra, in the middle Ganges Valley, and probably as far as the Bay of Bengal.
What was the language base of the Kushans?
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Answer: Indo-European


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
To improve the efficiency of the lamp, the filament usually consists of multiple coils of coiled fine wire, also known as a 'coiled coil'. For a 60-watt 120-volt lamp, the uncoiled length of the tungsten filament is usually 22.8 inches (580 mm), and the filament diameter is 0.0018 inches (0.046 mm). The advantage of the coiled coil is that evaporation of the tungsten filament is at the rate of a tungsten cylinder having a diameter equal to that of the coiled coil. The coiled-coil filament evaporates more slowly than a straight filament of the same surface area and light-emitting power. As a result, the filament can then run hotter, which results in a more efficient light source, while reducing the evaporation so that the filament will last longer than a straight filament at the same temperature.
What did not improve efficiency of the lamp?
A: unanswerable


Context and question: The Alaska Permanent Fund is a constitutionally authorized appropriation of oil revenues, established by voters in 1976 to manage a surplus in state petroleum revenues from oil, largely in anticipation of the recently constructed Trans-Alaska Pipeline System. The fund was originally proposed by Governor Keith Miller on the eve of the 1969 Prudhoe Bay lease sale, out of fear that the legislature would spend the entire proceeds of the sale (which amounted to $900 million) at once. It was later championed by Governor Jay Hammond and Kenai state representative Hugh Malone. It has served as an attractive political prospect ever since, diverting revenues which would normally be deposited into the general fund.
Why did Governor Keith Miller propose the Alaska Permanent Fund before the Prudhoe Bay sale?
Answer: fear that the legislature would spend the entire proceeds of the sale (which amounted to $900 million) at once


Question: A new phase in neoclassical design was inaugurated by Robert and James Adam, who travelled in Italy and Dalmatia in the 1750s, observing the ruins of the classical world. On their return to Britain, they published a book entitled The Works in Architecture in installments between 1773 and 1779. This book of engraved designs made the Adam repertory available throughout Europe. The Adam brothers aimed to simplify the rococo and baroque styles which had been fashionable in the preceding decades, to bring what they felt to be a lighter and more elegant feel to Georgian houses. The Works in Architecture illustrated the main buildings the Adam brothers had worked on and crucially documented the interiors, furniture and fittings, designed by the Adams.
Is there an answer to this question: Who began the new phase of neoclassical design?

Answer: Robert and James Adam


Question: Gaddafi's earliest education was of a religious nature, imparted by a local Islamic teacher. Subsequently moving to nearby Sirte to attend elementary school, he progressed through six grades in four years. Education in Libya was not free, but his father thought it would greatly benefit his son despite the financial strain. During the week Gaddafi slept in a mosque, and at weekends walked 20 miles to visit his parents. Bullied for being a Bedouin, he was proud of his identity and encouraged pride in other Bedouin children. From Sirte, he and his family moved to the market town of Sabha in Fezzan, south-central Libya, where his father worked as a caretaker for a tribal leader while Muammar attended secondary school, something neither parent had done. Gaddafi was popular at school; some friends made there received significant jobs in his later administration, most notably his best friend Abdul Salam Jalloud.
Is there an answer to this question: Why was Gaddafi made fun of in elementary school?

Answer:
Bullied for being a Bedouin, he was proud of his identity and encouraged pride in other Bedouin children.