118The Extinction of the Dinosaurs讲解

117The Emergence of Civilization讲解

116The Early History of Motion Pictures讲解

115The Dvaravati Civilization讲解

114The Development of Printing讲解

082Motor Development in Children讲解

113The Cosmological Principle讲解

112The Collapse of the Maya讲解

111The Climate of Japan讲解

110The Classic Mayan Collapse讲解