Dark Matter is a 2-book series with 2 released primary works first released in 2000 with contributions by W.E.B. Du Bois, Kalamu ya Salaam, Samuel R. Delany, Nalo Hopkinson, Akua Lezli Hope, Charles W. Chesnutt, Linda Addison, Charles R. Saunders, Nisi Shawl, Steven Barnes and 30 others.