Changes brought on by the dynamic nature of science, emerging technologies, and risk analysis keep scientists engaged. But sometimes they bring controversy. Case in point: Several papers published in Environmental Health Perspectives and Nature (Becker et al., 2009, 2010; Lorentzen and Hattan, 2010; Myers et al., 2009a,b; Tweedale, 2010; Tyl, 2010; and Vom Saal and Myers, 2010) by scientists in the research and regulatory communities contrasted Good Laboratory Practices (GLP, 21 CFR Part 58) gui…