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Mathematics: The earliest traces of mathematical knowledge in the Indian subcontinent appear with the Indus Valley Civilization (c. 4th millennium BC ~ c. 3rd millennium BC). The people of this civilization made bricks whose dimensions were in the proportion 4:2:1, considered favorable for the stability of a brick structure. They also tried to standardize measurement of length to a high degree of accuracy. They designed a rulerthe Mohenjo-daro rulerwhose unit of length (approximately 1.32 inches or 3.4 centimetres) was divided into ten equal parts. Bricks manufactured in ancient Mohenjo-daro often had dimensions that were integral multiples of this unit of length.
What proportional size were the bricks that the civilization used?
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The answer: 4:2:1

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A psychological identity relates to self-image (one's mental model of oneself), self-esteem, and individuality. Consequently, Weinreich gives the definition "A person's identity is defined as the totality of one's self-construal, in which how one construes oneself in the present expresses the continuity between how one construes oneself as one was in the past and how one construes oneself as one aspires to be in the future"; this allows for definitions of aspects of identity, such as: "One's ethnic identity is defined as that part of the totality of one's self-construal made up of those dimensions that express the continuity between one's construal of past ancestry and one's future aspirations in relation to ethnicity" (Weinreich, 1986a).
What aspect or type of identity does Weinreich single out?
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The answer: ethnic identity

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Zinc(I) compounds are rare, and require bulky ligands to stabilize the low oxidation state. Most zinc(I) compounds contain formally the [Zn2]2+ core, which is analogous to the [Hg2]2+ dimeric cation present in mercury(I) compounds. The diamagnetic nature of the ion confirms its dimeric structure. The first zinc(I) compound containing the ZnZn bond, (5-C5Me5)2Zn2, is also the first dimetallocene. The [Zn2]2+ ion rapidly disproportionates into zinc metal and zinc(II), and has only been obtained as a yellow glass formed by cooling a solution of metallic zinc in molten ZnCl2.
What core do most zinc(l) compounds contain?
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The answer: [Zn2]2+

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When Internet hunting was introduced in 2005, allowing people to hunt over the Internet using remotely controlled guns, the practice was widely criticised by hunters as violating the principles of fair chase. As a representative of the National Rifle Association (NRA) explained, "The NRA has always maintained that fair chase, being in the field with your firearm or bow, is an important element of hunting tradition. Sitting at your desk in front of your computer, clicking at a mouse, has nothing to do with hunting."
What did hunters feel hunting over the Internet violated?
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The answer:
principles of fair chase