Clark County Genealogical Society presents “Evaluating Online Family Trees, Cleaning Up the Internet” from 10 to 11:30 a.m. May 6 at the Clark County Genealogical Society Library. Steve Aberle will teach attendees to examine what others have posted online in order to make an informed decision about whether those lineage claims are based on fact or fiction and if they’re worthy to include in your own genealogy research. The cost is $15 for society members or $20 for non-members.