Clark made a noise that was halfway between a grunt and a sniff. "To do that, you'll need to master third-order differential equations, Poddy. Last night, you spent two hours trying to explain to the nursery attendant why babies shouldn't be kept in centralized crèches."
Classic Sci-Fi Review: Podkayne of Mars by Robert A. Heinlein podkayne
"I’m not checking the navigation, you little monster," Podkayne replied, though her voice lacked any real bite. "I’m looking at the stars. I am going to command a ship like this one day, Clark. A real exploration cruiser. Not just a luxury liner filled with tourists who think Martians are practically savages." Clark made a noise that was halfway between