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- What Is the Difference Between a Hypothesis and a Scientific Theory?Biology
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- What Percentage of Abortions Are Due to Rape or Incest?Reproductive
- How Many Cases of Polio Are There in the US?Healthcare
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- What Percentage of Americans Are Addicted to Drugs?Substances
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- How Many People Have Type 2 Diabetes in the US?Hormones
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- How Many People Were Killed by the Spanish Flu?Healthcare