How do scientists repeat experiments already done by someone else?

How do scientists repeat experiments already done by someone else?
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They try to measure the same circumstances as the original studyin the same way. So, for instance if the original study was tryingto figure out if cell phones were harmful, and the original studytested cell phones on rats, they would get a bunch of rats andexpose one group to cell phone signals all day, and the other groupnot at all, and see if they got the same results as the firstpeople who did that... they are basically checking the work of thefirst scientists, and seeing if the same thing happens everytime.
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