Here is a question about this article: Upon exposure, the amount of light energy that reaches the film determines the effect upon the emulsion. If the brightness of the light is multiplied by a factor and the exposure of the film decreased by the same factor by varying the camera's shutter speed and aperture, so that the energy received is the same, the film will be developed to the same density. This rule is called reciprocity. The systems for determining the sensitivity for an emulsion are possible because reciprocity holds. In practice, reciprocity works reasonably well for normal photographic films for the range of exposures between 1/1000 second to 1/2 second. However, this relationship breaks down outside these limits, a phenomenon known as reciprocity failure.
What is the answer to this question: How is the exposure of film changed?
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So... by varying the camera's shutter speed and aperture

Here is a question about this article: Usually, a federation is formed at two levels: the central government and the regions (states, provinces, territories), and little to nothing is said about second or third level administrative political entities. Brazil is an exception, because the 1988 Constitution included the municipalities as autonomous political entities making the federation tripartite, encompassing the Union, the States, and the municipalities. Each state is divided into municipalities (municipios) with their own legislative council (camara de vereadores) and a mayor (prefeito), which are partly autonomous from both Federal and State Government. Each municipality has a "little constitution", called "organic law" (lei organica). Mexico is an intermediate case, in that municipalities are granted full-autonomy by the federal constitution and their existence as autonomous entities (municipio libre, "free municipality") is established by the federal government and cannot be revoked by the states' constitutions. Moreover, the federal constitution determines which powers and competencies belong exclusively to the municipalities and not to the constituent states. However, municipalities do not have an elected legislative assembly.
What is the answer to this question: What is each state divided into?
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So... municipalities

Here is a question about this article: In September 2015, the 193 member states of the United Nations unanimously adopted the Sustainable Development Goals, a set of 17 goals aiming to transform the world over the next 15 years. These goals are designed to eliminate poverty, discrimination, abuse and preventable deaths, address environmental destruction, and usher in an era of development for all people, everywhere.
What is the answer to this question: The Sustainable Development Goals are intended to change the world over what time period?
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So...
15 years