First Sentence:
There were many failures before humans successfully learned to fly.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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unmeasured selectivity, nonexperimental social research, initial causal variable, control variable approach, random assignment model, outmigration rate, desegregated cities, most social researchers, contemporary social research, selectivity operating, counterfactual conditional statement, superficial causes, flowering height, natural science experiments, selective forces operating, selectivity issue, empirical social research, given dependent variable, nonrandom assignment, controlling procedure, causal proposition, educational distribution, causal principles, educated fathers
Key Phrases - Capitalized Phrases (CAPs):
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United States, Problem of Contamination, World War, Central Place Theory, Error of Contamination, Ceteris Paribus Error
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