Here is a question about this article: Zinc is an essential mineral perceived by the public today as being of "exceptional biologic and public health importance", especially regarding prenatal and postnatal development. Zinc deficiency affects about two billion people in the developing world and is associated with many diseases. In children it causes growth retardation, delayed sexual maturation, infection susceptibility, and diarrhea. Enzymes with a zinc atom in the reactive center are widespread in biochemistry, such as alcohol dehydrogenase in humans. Consumption of excess zinc can cause ataxia, lethargy and copper deficiency.
What is the answer to this question: How many people are affected by zinc deficiency?
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So... two billion

Here is a question about this article: Uranium-235 was the first isotope that was found to be fissile. Other naturally occurring isotopes are fissionable, but not fissile. On bombardment with slow neutrons, its uranium-235 isotope will most of the time divide into two smaller nuclei, releasing nuclear binding energy and more neutrons. If too many of these neutrons are absorbed by other uranium-235 nuclei, a nuclear chain reaction occurs that results in a burst of heat or (in special circumstances) an explosion. In a nuclear reactor, such a chain reaction is slowed and controlled by a neutron poison, absorbing some of the free neutrons. Such neutron absorbent materials are often part of reactor control rods (see nuclear reactor physics for a description of this process of reactor control).
What is the answer to this question: What does a neutron poison absorb?
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So... free neutrons

Here is a question about this article: Israelites enjoyed political independence twice in ancient history, first during the periods of the Biblical judges followed by the United Monarchy.[disputed discuss] After the fall of the United Monarchy the land was divided into Israel and Judah. The term Jew originated from the Roman "Judean" and denoted someone from the southern kingdom of Judah. The shift of ethnonym from "Israelites" to "Jews" (inhabitant of Judah), although not contained in the Torah, is made explicit in the Book of Esther (4th century BCE), a book in the Ketuvim, the third section of the Jewish Tanakh. In 587 BC Nebuchadnezzar II, King of the Neo-Babylonian Empire, besieged Jerusalem, destroyed the First Temple, and deported the most prominent citizens of Judah. In 586 BC, Judah itself ceased to be an independent kingdom, and its remaining Jews were left stateless. The Babylonian exile ended in 539 BCE when the Achaemenid Empire conquered Babylon and Cyrus the Great allowed the exiled Jews to return to Yehud and rebuild their Temple. The Second Temple was completed in 515 BCE. Yehud province was a peaceful part of the Achaemenid Empire until the fall of the Empire in c. 333 BCE to Alexander the Great. Jews were also politically independent during the Hasmonean dynasty spanning from 140 to 37 BCE and to some degree under the Herodian dynasty from 37 BCE to 6 CE. Since the destruction of the Second Temple in 70 CE, most Jews have lived in diaspora. As an ethnic minority in every country in which they live (except Israel), they have frequently experienced persecution throughout history, resulting in a population that has fluctuated both in numbers and distribution over the centuries.[citation needed]
What is the answer to this question: When did the Babylonian exile end?
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So...
539 BCE