Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Nazi eugenics were Nazi Germany''s racially-based social policies that placed the improvement of the race through eugenics at the center of their concerns and targeted those humans they identified as "life unworthy of life" (German Lebensunwertes Leben), including but not limited to the criminal, degenerate, dissident, feeble-minded, homosexual, idle, insane, religious, and weak, for elimination from the chain of heredity. More than 400,000 people were sterilized against their will, while 70,000 were killed in the Action T4.