Over the course of the 1930s, entertainment on radio evolved into a mix of drama, situation comedy, soap opera, and kids' programming that would serve as the model for broadcast entertainment for the rest of the century.

Advertising agencies as we know them today came into existence at the dawn of the twentieth century. These agencies were reluctant to move into radio advertising, but in the US, the medium was soon dominated by them.

In Germany in the 1930s, modern science was exploring the limits of what can be known, at the same time the Nazi political movement was claiming absolute knowledge.

Just weeks after the Munich Agreement avoided a war, Germany was wracked by a spasm of internal anti-Semitic violence.

Adolf Hitler was gearing up for an invasion of Czechoslovakia. Then Neville Chamberlain intervened.

Hitler's first step on his plan to expand Germany to the east was to annex Austria.

Hitler wanted closer relations with both Britain and Italy. He got half his wish.

Fairy tales date back at least to medieval Europe, and probably further back than that. The 19th century demoted them to children's entertainment, but the twentieth century will find new uses for them.

Chiang Kai-shek has had enough. When the Japanese provoke a confrontation, Chiang and his new Communist allies do not back down, and the result is war.

Dissenting generals kidnap Chiang Kai-shek and force him to negotiate with the Chinese, while in Japan, right-wing radicals in the military consolidate their power.