The problem: Answer a question about this article:
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.
Who's equations helped to imply vanishing of the Ricci tensor?
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The answer: Einstein

Problem: Please answer a question about the following article about Hindu philosophy:
The Vedanta school built upon the teachings of the Upanishads and Brahma Sutras from the first millennium BCE and is the most developed and well-known of the Hindu schools. The epistemology of the Vedantins included, depending on the sub-school, five or six methods as proper and reliable means of gaining any form of knowledge: pratyaksa (perception), anumana (inference), upamana (comparison and analogy), arthapatti (postulation, derivation from circumstances), anupalabdi (non-perception, negative/cognitive proof) and sabda (word, testimony of past or present reliable experts). Each of these have been further categorized in terms of conditionality, completeness, confidence and possibility of error, by each sub-school of Vedanta.
In what time did the Vedanta school become active?
A: first millennium BCE

Question: Read this and answer the question

The economy relies heavily on investment and support from Armenians abroad. Before independence, Armenia's economy was largely industry-based chemicals, electronics, machinery, processed food, synthetic rubber, and textile and highly dependent on outside resources. The republic had developed a modern industrial sector, supplying machine tools, textiles, and other manufactured goods to sister republics in exchange for raw materials and energy. Recently, the Intel Corporation agreed to open a research center in Armenia, in addition to other technology companies, signalling the growth of the technology industry in Armenia.

The Arnmenian economy depends primarily on what?
Answer: investment and support from Armenians abroad

Problem: Many teachers at Sabha were Egyptian, and for the first time Gaddafi had access to pan-Arab newspapers and radio broadcasts, most notably the Cairo-based Voice of the Arabs. Growing up, Gaddafi witnessed significant events rock the Arab world, including the 1948 ArabIsraeli War, the Egyptian Revolution of 1952, the Suez Crisis of 1956, and the short-lived existence of the United Arab Republic between 1958 and 1961. Gaddafi admired the political changes implemented in the Arab Republic of Egypt under his hero, President Gamal Abdel Nasser. Nasser argued for Arab nationalism; the rejection of Western colonialism, neo-colonialism, and Zionism; and a transition from capitalism to socialism. Nasser's book, Philosophy of the Revolution, was a key influence on Gaddafi; outlining how to initiate a coup, it has been described as "the inspiration and blueprint of [Gaddafi's] revolution."
What political leader did Gaddafi greatly admire?
The answer is the following: Nasser

In many places in Switzerland, household rubbish disposal is charged for. Rubbish (except dangerous items, batteries etc.) is only collected if it is in bags which either have a payment sticker attached, or in official bags with the surcharge paid at the time of purchase. This gives a financial incentive to recycle as much as possible, since recycling is free. Illegal disposal of garbage is not tolerated but usually the enforcement of such laws is limited to violations that involve the unlawful disposal of larger volumes at traffic intersections and public areas. Fines for not paying the disposal fee range from CHF 200500.
What is the charge for recycling in Switzerland?
free

Here is a question about this article: A variation of the incandescent lamp did not use a hot wire filament, but instead used an arc struck on a spherical bead electrode to produce heat. The electrode then became incandescent, with the arc contributing little to the light produced. Such lamps were used for projection or illumination for scientific instruments such as microscopes. These arc lamps ran on relatively low voltages and incorporated tungsten filaments to start ionization within the envelope. They provided the intense concentrated light of an arc lamp but were easier to operate. Developed around 1915, these lamps were displaced by mercury and xenon arc lamps.
What is the answer to this question: What was a common application for this type of bulb?
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So...
scientific instruments such as microscopes