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How many times is the average domestic sex trafficking victim who is enslaved before the age of 18 raped?

How much of U.S. petroleum consumption is imported from the Persian Gulf?

Which of the following energy sources provides the most primary energy for the United States?

What portion of U.S. students in prekindergarten through 12th grade receive federally subsidized free or reduced-price lunches each school day?

Has the earth experienced a general change in average rainfall over the past 150 years?

What portion of full-time, new students who enroll in a 2-year public college graduate from that college within 150% of the normal time required to do so?

When conventional public schools are subject to school choice programs that allow students to leave for private or charter schools, do the children who remain in the public schools academically decline?

Has the portion of U.S. adults who use marijuana increased or decreased over the past three years?

Is a racial disparity in vehicle stops proof of racial bias among police?

On average, how much time per week do full-time students at 4-year colleges spend on educational activities (like attending class and studying) during the school year?