A German geology professor makes a subterranean expedition in which 1864 classic by Jules Verne?

In Jewish usage, what is a gentile? Which store chain did Sam Walton co-found in 1962? A German-born printer named Louis Prang introduced which holiday cards to the U.S. in 1875? Which German master wrote the autobiography "Poetry and Truth", begun in 1811? Which German river gives its name to wine grown on its banks? What were German submarines in the two World Wars commonly called? A German woman may pluck her "Augenbrauen". What are they? A gerontocracy is a government ruled by whom?