The Brick Moon's accidental crewed launch
A group of New Englanders build a 200-foot hollow brick sphere, since brick survives the frictional heat of passage through air. They plan to hurl it into orbit with two giant water-driven flywheels. Before the planned launch, the sphere slips onto the spinning wheels and is flung into orbit with thirty-some workers and their families still living inside. The narrator later finds it through a telescope, discovers the people are alive, and exchanges messages with them: they signal by jumping in long and short Morse-code patterns on its surface.
