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Matter should not be confused with mass, as the two are not quite the same in modern physics. For example, mass is a conserved quantity, which means that its value is unchanging through time, within closed systems. However, matter is not conserved in such systems, although this is not obvious in ordinary conditions on Earth, where matter is approximately conserved. Still, special relativity shows that matter may disappear by conversion into energy, even inside closed systems, and it can also be created from energy, within such systems. However, because mass (like energy) can neither be created nor destroyed, the quantity of mass and the quantity of energy remain the same during a transformation of matter (which represents a certain amount of energy) into non-material (i.e., non-matter) energy. This is also true in the reverse transformation of energy into matter.
What can be created or destroyed?
A: unanswerable

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Drug discovery is the process by which potential drugs are discovered or designed. In the past most drugs have been discovered either by isolating the active ingredient from traditional remedies or by serendipitous discovery. Modern biotechnology often focuses on understanding the metabolic pathways related to a disease state or pathogen, and manipulating these pathways using molecular biology or biochemistry. A great deal of early-stage drug discovery has traditionally been carried out by universities and research institutions.
What is a remedy discovery?
A: unanswerable

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The islands have a population of 301. The main settlement is Edinburgh of the Seven Seas (known locally as "The Settlement"). The only religion is Christianity, with denominations of Anglican and Roman Catholic. The current population is thought to have descended from 15 ancestors, eight males and seven females, who arrived on the island at various times between 1816 and 1908. The male founders originated from Scotland, England, The Netherlands, the United States and Italy, belonging to 3 Y-haplogroups: I (M170), R-SRY10831.2 and R (M207) (xSRY10831.2) and share just eight surnames: Glass, Green, Hagan, Lavarello, Patterson, Repetto, Rogers, and Swain.[n 1] There are 80 families on the island. Tristan da Cunha's isolation has led to an unusual, patois-like dialect of English described by the writer Simon Winchester as "a sonorous amalgam of Home Counties lockjaw and nineteenth century idiom, Afrikaans slang and Italian." Bill Bryson documents some examples of the island's dialect in his book, The Mother Tongue.
From how many ancestors is the current population of 15 thought to have descended from?
A: unanswerable

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According to this theory, the conditions for the truth of a sentence as well as the sentences themselves are part of a metalanguage. So, for example, the sentence "Snow is white" is true if and only if snow is white. Although many philosophers have interpreted, and continue to interpret, Tarski's theory as a deflationary theory, Popper refers to it as a theory in which "is true" is replaced with "corresponds to the facts". He bases this interpretation on the fact that examples such as the one described above refer to two things: assertions and the facts to which they refer. He identifies Tarski's formulation of the truth conditions of sentences as the introduction of a "metalinguistic predicate" and distinguishes the following cases:
What does Tarski base his interpretation of Popper on?
A:
unanswerable