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I can corroborate the (gp?) note above regarding numbers of PhD students dropping out because foundational research results that do not appear to be correct in molecular biology. It's just anecdata, but biology and chemistry, especially the expensive and difficult kinds (>1-2 years to attempt to repeat) is probably not reproduced as often as you'd like, and as far as I am aware, it's hard to get a PhD if you have identified serious shortcomings in important, but foundational, research. We may be wasting a lot of talent this way.