Efforts to share research with the public must include mechanisms to prevent harm resulting from low-quality work.The case for releasing preprints is clear: results from scientific studies are made more quickly and more broadly available. Overall, greater sharing and transparency boosts trustworthiness and collaboration. But efforts to promote preprints without simultaneously implementing firm measures to ensure that the research is of high quality put the cart before the horse. All proponents of open science should have two responsibilities: to promote practices such as preprint publication, and to prevent them from doing harm. Article from nature.com.