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Front Matter

Source of Rare Hydrogen Isotope Made at Princeton

Study Why Airplane Propellers Break in Air

British Research Upsets Values for Atomic Weights

High Maternal Death Rate Not Explained by Reporting

People inside the Earth Excited America in 1822

Einstein’s Relativity Defended at Princeton

Stone Age Venuses Were Not All Fat

Argentina to London Record of Ultra-Short Radio Waves

War against Bacteria Only Sporting Proposition

Germ Causing Dandruff Found by St. Louis Scientists