121The First Settlers in Ancient Amazonia讲解

120The First Eyes讲解

119The Faint Young Sun Paradox讲解

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

113The Cosmological Principle讲解

112The Collapse of the Maya讲解