The French political philosopher Raymond Aron once observed that the twentieth century "could have been Germany's century." In 1900, the country was Europe's preeminent power, its material strength and strident militaristic ethos apparently balanced by a vital culture and extraordinary scientific achievement. It was poised to achieve greatness. In Einstein's German World, the eminent historian Fritz Stern explores the ambiguous promise of Germany before Hitler, as well as its horrifying decline into moral nihilism under Nazi rule, and aspects of its remarkable recovery since World War II. He does so by gracefully blending history and biography in a sequence of finely drawn studies of Germany's great scientists and of German-Jewish relations before and during Hitler's regime.