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Scientists repeat experiments for reliability. The experiment must be repeated for the scientist to develop a theory. One experiment does not prove your hypothesis correct; therefore, it must be done a several times.
They might just want to retest ,but there are other reasons not everyone could be sure of that.
This is called a hypothesis.
Theories have to be proved A true scientist will repeat the same experiment several times to check the accuracy of his/her data. They will also use controls of the same type to make certain the experiment is stable. After they have concluded the experiment is true then they will publish it and allow other scientists to preform the same experiments to prove it correct. In every experiment there are many variables and different conditions that can be experienced. From this knowledge a true scientist will make sure that under all circumstances the experiment will hold true.
The reason they would is because it is a lot safer.