“…Although scientists are directly funded to produce new knowledge, they spend significant time searching for, using, and developing software that enables those results. The sustainability of scientific software -the ability to maintain the software in a state where scientists can understand, replicate, and extend prior reported results that depend on that software -has sometimes been an afterthought because scientists are rewarded for the publications they write, not the software they create and support [25,26]. This software, however, is a critical link in the chain of evidence establishing new scientific knowledge, and thus other scientists need to be able to run this software in order to understand and replicate this new knowledge, and apply it to new problems.…”