New review articles on human population genetics based on studies of ancient DNA Wikipedia has a lot of interesting articles based on the ongoing research in human molecular genetics that helps trace the lineage of people living in various places on the earth I ve been reading university textbooks on human genetics for fun since the 1980s and for even longer I ve been visiting my state flagship university s vast BioMedical Library to look up topics on human medicine and health care policy On the hypothesis that better sources build better articles as all of us here collaborate to build an encyclopedia I thought I would suggest some sources for improving articles on human genetic history and related articles The Wikipedia guidelines on reliable sources in medicine provide a helpful framework for evaluating sources The guidelines on reliable sources for medicine remind editors that it is vital that the biomedical information in all types of articles be based on reliable third party published sources and accurately reflect current medical knowledge The guidelines consistent with the general Wikipedia guidelines on reliable sources remind us that all Wikipedia articles should be based on reliable published secondary sources emphasis in original They helpfully define a primary source in medicine as one in which the authors directly participated in the research or documented their personal experiences By contrast a secondary source summarizes one or more primary or secondary sources usually to provide an overview of the current understanding of a medical topic The general Wikipedia guidelines let us know that Articles should rely on secondary sources whenever possible For example a review article monograph or textbook is better than a primary research paper When relying on primary sources extreme caution is advised Wikipedians should never interpret the content of primary sources for themselves Two review articles in prominent journals about human population genetics are bringing together analysis of the many recent studies of human DNA including DNA from ancient individuals Earlier studies of this issue were based on more limited samples fewer genes and fewer human individuals from fewer regions and only recent times As more samples of more genes from more individuals from more places and times are gathered the molecular evidence is making it increasingly clear that human beings have been moving back and forth across the Earth s surface and mixing genes over long distances ever since their earliest ancestors moved out of the human homeland in Africa talk