For centuries, inventors, scientists, and dreamers have been captivated by the idea of a machine that never stops moving, a device that could generate limitless energy without ever needing fuel or an external power source. From ancient designs to modern-day experiments, countless attempts have been made to achieve this so-called "perpetual motion machine."
Despite the ingenuity behind these ideas, however, every single one has ultimately failed. But why is it that no perpetual motion machine has ever worked? What fundamental principles of the universe stand in the way? And is there any possibility that future discoveries could challenge what we think we know? Click through this gallery to find out.