The quantitative study of sexual and natural selection in the Animal Kingdom. The Weimar Republic, also known as interwar Germany, lasted from 1919 and 1933, and was basically a sexual free-for-all. Researchers believe the answer lies in what is. Maselko and Smanski's team reported in Nature Communications1 in October. A quick trip through the life cycle of a salmon, be it hatchery or wild, makes human.