Feature

Synthetic Hormones May Be Too Pure to Be Effective

Front Matter

New Kind of Atom Smashing Liberates Millions of Volts

Land Animals Small When Coal Was Forming

Bacteria Exploded in Making of New Type of Vaccines

Navy Airplanes to Be Free of Carbon Monoxide

Encouraging Fit Parents to Bear Children Advised

Little Earthquakes of Traffic Recorded by Tiny Seismograph

British Anthropologists Doubt Age of Oldoway Man

Your Chances of Death by Earthquake

In Science Fields

Hay Fever First Described: “A Classic of Science”