Where did it all start? Why was it so appealing?

While the Nazis were the first to implement it on such a widespread and radical scale, the "science" of eugenics did not originate with them. Rather, this concept was born from a selective reading of the evolutionary theories of Charles Darwin, and it was an international sensation. Most historians agree that eugenics was accepted by so many as a "science", not so much because of extensive evidence or research, but because of a boiling racial prejudice that plagued the major countries where it took root.