 Epistemologies of Ignorance. Ignorance, like knowledge, has systematic patterns and social-structural causes (Pohlhaus 2011, Proctor &amp; Schiebinger 2008, Sullivan &amp; Tuana 2007, Tuana &amp; Sullivan 2006). Injustice in according people status as knowers and inquirers generates systematic ignorance that damages the interests of subordinated groups. Society could have access to, but forget or suppress, knowledge useful to subordinated groups—for example, about plants that are effective abortifactants (Schiebinger 2007). Since accurate information on such matters is or was available, explanation is needed for why it is forgotten. Ignorance is sometimes due to to segregation of situated knowers, preventing knowledge or understandings held by subordinate groups from disseminating (Margonis 2007). Members of subordinated groups may have strategic interests in hiding knowledge about themselves from dominant groups (Bailey 2007). Most importantly, dominant groups have interests in avoiding the truth about their own injustices (Mills 2007).