Article: There is a theory that vinyl records can audibly represent higher frequencies than compact discs. According to Red Book specifications, the compact disc has a frequency response of 20 Hz up to 22,050 Hz, and most CD players measure flat within a fraction of a decibel from at least 20 Hz to 20 kHz at full output. Turntable rumble obscures the low-end limit of vinyl but the upper end can be, with some cartridges, reasonably flat within a few decibels to 30 kHz, with gentle roll-off. Carrier signals of Quad LPs popular in the 1970s were at 30 kHz to be out of the range of human hearing. The average human auditory system is sensitive to frequencies from 20 Hz to a maximum of around 20,000 Hz. The upper and lower frequency limits of human hearing vary per person.

Question: Does the hearing range of the human vary?
Ans: The upper and lower frequency limits of human hearing vary per person

Article: During the 11th century, developments in philosophy and theology led to increased intellectual activity. There was debate between the realists and the nominalists over the concept of "universals". Philosophical discourse was stimulated by the rediscovery of Aristotle and his emphasis on empiricism and rationalism. Scholars such as Peter Abelard (d. 1142) and Peter Lombard (d. 1164) introduced Aristotelian logic into theology. In the late 11th and early 12th centuries cathedral schools spread throughout Western Europe, signalling the shift of learning from monasteries to cathedrals and towns. Cathedral schools were in turn replaced by the universities established in major European cities. Philosophy and theology fused in scholasticism, an attempt by 12th- and 13th-century scholars to reconcile authoritative texts, most notably Aristotle and the Bible. This movement tried to employ a systemic approach to truth and reason and culminated in the thought of Thomas Aquinas (d. 1274), who wrote the Summa Theologica, or Summary of Theology.

Question: What ancient philosopher was rediscovered, leading to a revival of philosophy?
Ans: Aristotle

Article: Shell sold 9.5% of its 23.1% stake in Woodside Petroleum in June 2014 and advised that it had reached an agreement for Woodside to buy back 9.5% of its shares at a later stage. Shell became a major shareholder in Woodside after a 2001 takeover attempt was blocked by then federal Treasurer Peter Costello and the corporation has been open about its intention to sell its stake in Woodside as part of its target to shed assets. At a general body meeting, held on 1 August 2014, 72 percent of shareholders voted to approve the buy-back, short of the 75 percent vote that was required for approval. A statement from Shell read: "Royal Dutch Shell acknowledges the outcome of Woodside Petroleum Limited's shareholders' negative vote on the selective buy-back proposal. Shell is reviewing its options in relation to its remaining 13.6 percent holding."

Question: What percentage of shareholders voted to approve the 2014 buy-back?
Ans: 72

Article: The blossoming literature, philosophy, medicine, and art of Iran became major elements in the formation of a new age for the Iranian civilization, during the period known as the Islamic Golden Age. The Islamic Golden Age reached its peak by the 10th and 11th centuries, during which Iran was the main theater of the scientific activities. After the 10th century, Persian language, alongside Arabic, was used for the scientific, philosophical, historical, musical, and medical works, whereas the important Iranian writers, such as Tusi, Avicenna, Qotb od Din Shirazi, and Biruni, had major contributions in the scientific writing.

Question: Where was the main area where the peak of scientific activity take place during the Islamic Golden Age?
Ans:
Iran