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What is the lowest known black market price for a shoulder-fired anti-aircraft missile?

What portion of the non-institutionalized, non-homeless U.S. adult population has a serious mental illness that substantially interferes with or limits one or more major life activities?

In the U.S., which of the following gender/racial/ethnic groups has the longest life expectancy?

According to EPA estimates, by how much does breathing air toxics from outdoor sources increase the average lifetime risk of developing cancer?

Which U.S. president issued a regulation declaring that HIV was not a “communicable disease of public health significance”?

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?