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When Albert-László Barabási, a computational scientist at Northeastern University in Boston, Massachusetts, submitted a paper to the preprint server bioRxiv last month, he received an unexpected response. The biomedical repository would no longer accept manuscripts making predictions about treatments for COVID-19 solely on the basis of computational work. The bioRxiv team suggested that Barabási submit the study to a journal for rapid peer review, instead of posting it as a preprint.