What is a fundamental requirement of the scientific method?

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The researcher must remain impartial.Scientists need to use highly accurate tools.Only accurate hypotheses should be examined.Testing is limited to specific theories.Scientists must work with test tubes and maintain a sterile laboratory.

Explanation

The scientific method relies on the researcher maintaining objectivity to ensure unbiased and valid results. While precise instruments and proper lab conditions are helpful, the core requirement is that the scientist approaches the investigation without personal bias.