(Phys.org)—A professor of structural biology and an informatics researcher have together written a paper outlining age bias in grant offerings by the National Institutes of Health over the past several decades. They show how older principal investigators (PIs) have traditionally been given more grants but note that new initiatives by NIH appear to be having a positive impact. Michael and Jonathan Levitt, who happen to be brothers, have published their work in Proceedings of the National Academy of Sciences.