. . . . . . . . . . . . "Juvenile works"@en . "Juvenile works" . . . . . "Examines the passing of time and how it has been measured through history, by such methods as observation of natural cycles and different kinds of clocks and watches."@en . . "Examines the passing of time and how it has been measured through history, by such methods as observation of natural cycles and different kinds of clocks and watches." . "Time"@en . "Book of time"@en . . "The super science book of time"@en . "The super science book of time" . .