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What portion of Americans between the ages of 17 and 24 are disqualified from military service for physical, intellectual, or ethical shortcomings?

Are Social Security old-age benefits subject to federal income taxes?

Over the past three decades, which grew by a greater percentage: the income earned by U.S. middle-class households, or the government benefits received by these households?

In the U.S., which of these groups has the highest life expectancy?

How long after fertilization does a preborn human begin to suck his or her thumb?

What portion of U.S. residents live in counties that do not meet the EPA’s clean air standards for carbon monoxide?

In 1960, healthcare spending comprised 5.0% of the U.S. economy. How much is it today?

In the U.S., are more crimes committed with guns or prevented with guns?

How much did the average global sea level rise during the 20th century?

When Medicare began funding healthcare for seniors in 1966, there were 5.5 Americans aged 20-64 for every American aged 65 or older. How much did this ratio decline by 2012?