Feature

Poison Gas Danger

Earth’s Temperature Mild When It Was Young

Nature Ramblings: Ground Pine

Heart Beats Long after Breathing Stops

Poor Spiritual Health

Chance of Living to 100

New Machines and Gadgets

Front Matter

Clear Los Angeles Smog

[Photograph]: “Hot” Laundry Waste

Obsolete C. D. Plans

Illusions Fool Monkeys