interoffice memoranda, testimony, secondary compilations of primary sources, letters from spouses, death certificates, burial notices, film badge records, computer programs, and benefits and compensation claims.
While any one type or source of data may be biased; taken together, these biases sometimes offset each other, at least partially. And, when independent sources corroborate specific facts, confidence in the accuracy of the information increases.
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Data Sources for the Crossroads Study ."
Mortality of Veteran Participants in the CROSSROADS Nuclear Test . Washington, DC: The National Academies Press,
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As of 2013, the National Science Education Standards have been replaced by the Next Generation Science Standards (NGSS), available as a print book, free PDF download, and online with our OpenBook platform.
The NGSS offer a detailed description of the key scientific ideas and practices that all students should learn by the time they graduate from high school. The standards are based largely on the 2011 National Research Council report A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas.