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Over the entire earth, what is the ratio of trees to people?

What portion of all public school students receive services from federally supported special education programs for children or youth with disabilities?

Scientifically speaking, when does human life begin?

What portion of all U.S. crude oil production is achieved through fracking?

In the U.S., has the average hourly compensation of workers risen at about the same rate as their productivity for most of past 40 years?

What is the literal translation of the words that underlie the acronym “Nazi”?

In the U.S., which of the following types of families has the highest median cash income?

What former U.S. president do both the Republican and Democratic parties trace their origins to?

Has the total number of people in the world who live in extreme poverty increased or decreased since 1990?

From 2013 to 2015, how many illegal entries into the U.S. per year were recorded by the U.S. Border Patrol along the Mexican border?