Feature

Turquoise-Covered Skull Represents Mexican God

Hazelnut Butter Kept Unspoiled 2,700 Years

Excavations Shed Light on Story of Jewish Exile

They Are Certainly Dog Days and This Explains the Name

Machine Boss for Machines Invented by Engineers

First Glances at New Books

Philadelphia to See Stars Shining from Sheet Metal Sky

Front Matter

The Barbed Wire Fence: “A Classic Invention”

New Type of Silicosis Found in Wales

Photocell Tests Smoothness of Polished Metal

Geological Survey Dismissals Held Up