Describe how results of similar and repeated investigations may vary and suggest possible explanations for variations.
Unifying Concepts of Science.
Nature of Science (NOS)
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Recognize that information can be obtained merely by careful observation, but sometimes even more data can be collected by conducting scientific investigations.
Realize that when similar investigations give different results, the scientific challenge is to judge whether the differences are trivial or significant, and this often requires more investigations.
Describe how scientific investigations usually involve the collection of relevant evidence, the use of logical reasoning, and the application of imagination in devising hypotheses and explanations to make sense of the collected evidence.
Discover that when a scientific investigation is done the way it was done before, we expect to get a very similar result.
Show how most things are made of parts.