Hopeful inventors have for centuries tried to create machines that would run forever: gizmos such as wheels that turn unceasingly with no motor to drive them and engines that endlessly exploit the heat in the oceans to power ships.
Hopeful inventors have for centuries tried to create machines that would run forever: gizmos such as wheels that turn unceasingly with no motor to drive them and engines that endlessly exploit the heat in the oceans to power ships.