 The eleventh edition the Ku Klux Klan as protecting the white race and restoring order to the American South after the American Civil War, citing the need to "control the negro", and "the frequent occurrence of the crime of rape by negro men upon white women".Similarly, argues for eugenics, stating that it is irrational to "propagate low orders of intelligence, to feed the ranks of paupers, defectives and criminals ... which to-day constitute so threatening an obstacle to racial progress".The eleventh edition has no biography of Marie Curie, despite her winning of the Nobel Prize in Physics in 1903 and the Nobel Prize in Chemistry in 1911, although she is mentioned briefly under the biography of her husband Pierre Curie.