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Do higher marginal tax rates generally reduce the incentive to work?

At the outset of the Industrial Revolution in the late 1700s, about 0.03% of the Earth’s atmosphere was comprised of carbon dioxide. What is it now?

Compared to the U.S., how much higher are the murder rates in the top-4 birthplaces of illegal immigrants to the U.S.?

How does Common Core suggest that first graders solve the math problem 6 + 7?

Has the amount of land area in the world increased or decreased since 1985?

Is there more genetic variation between human races or within human races?

What portion of recent high school graduates who took the ACT college readiness exam met the test’s benchmarks for college readiness in all four subjects (English, reading, math, and science)?

What portion of all U.S. petroleum consumption is imported from the Persian Gulf?

What portion of all sexual assault allegations in the U.S. are false?

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