Tools enable scientists to make more accurate observations, and to observe things that they otherwise could not observe. For example, microscopes allow scientists to observe bacteria, which otherwise are too small to see.
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Scientists have to measure things accurately or else science would be pointless,
The scientific method is how scientists make an hypothesis to focus their observations.
To make new discoveries, scientists use the Scientific Method: identify a problem, make a hypothesis, develop and execute an experiment, make observations, analyze the results.
scientific method
...prove hypotheses, for one.