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Why did the dollar fall in value relative to other currencies in the first half of 2011?
Scientific Theories
Well-substantiated explanations of some aspect of the natural world, based on a body of evidence that has been repeatedly confirmed through observation and experimentation.
Natural Phenomena
Events or processes that occur in nature without human intervention, often studied in fields like physics, biology, and environmental science.
Different Disciplines
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Global Warming
The long-term rise in the average temperature of the Earth's climate system, often attributed to human activities such as burning fossil fuels and deforestation.
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