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What percentage of inmates in U.S. federal prisons have mental health problems?
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How much has the atmospheric concentration of carbon dioxide increased since the Industrial Revolution (taken as 1750)?
The Commitment to Development Index ranks the 27 richest nations on how much their policies benefit poor countries. Of these 27 nations, where did Canada rank on environmental protection in 2013?
How many years would it take a minimum wage worker to make what each of the Koch brothers makes in one hour?
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