Heinlein juveniles

The Heinlein juveniles are the science-fiction novels written by Robert A. Heinlein for Scribner's young-adult line. Each features "a young male protagonist entering the adult world of conflict, decisions, and responsibilities". Together, they tell a loosely connected story of space exploration. Scribner's published the first 12 between 1947 and 1958, but rejected the 13th, Starship Troopers. That one was instead published by Putnam. A 14th novel, Podkayne of Mars, is sometimes listed as a "Heinlein juvenile", although Heinlein himself did not consider it to be one. The intended market was teenaged boys, but the books have been enjoyed by a wide range of readers. Heinlein wanted to present challenging material to children, such as the firearms for teenagers in Red Planet. This led to "annual quarrels over what was suitable for juvenile reading" with Scribner's editors. In addition to the juveniles, Heinlein wrote two short stories about Scouting for boys and three short stories featuring Puddin', a teenaged female protagonist, for girls.