Volume of preprints posted in hard sciences (arXiv) and life sciences, from 1991 to 2017. In this time window, the total number of arXiv preprints submitted was 1,263,265 and life sciences was 32,284. The inset shows the recent, rapid growth of preprint submissions in the Life sciences (including submissions to "arXiv q-bio", "Nature Preceedings", "F1000Research", "PeerJ Preprints", "bioRxiv", "The Winnower", "preprints.org" and "Wellcome Open Research"). The data and the code required to reproduce this figure is available by clicking on the data and code icons. Data Source: arXiv and Pre-Pubmed. Originally published at \citep*{Pepe}