Feature

Road Roller of Prehistoric Road Builders Found in Yucatan

Synthetic Rubber Made Equal to Natural Product

Insects Use Many Devices to Live through Winter

Universe Seems to Throb Slowly, like a Giant Heart

First Glances at New Books

Ultraviolet Light Detects Ringworm in Kittens

Well-Fed Children Protected against Ills, Research Shows

Recovery Program Aims at Human Resource Conservation

Front Matter

Blue Dye May Be “Antidote” to Cancer-Causing Substances

Tests Reveal Students’ Attitude toward Parents

Geologists Find Poetry in Rocks; Poets Write Geology