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Lots of scientific results are repeated but not published. If it doesn't work then people just move on. The problem is journals. There is no way to publish your attempts to repeat an experiment, unless you put it into another paper.

The other issue, especially in the life sciences, is inaquedate statistical input. If someone performs an underpowered, confounded experiment and gets a positive result, then someone else performs the same underpowered confounded experiment and gets a negative result, what have we learned except that the experiment is underpowered?

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