Feature

If America Had Not Been Discovered

Pipe for Gaging Speed of Light

Nature Ramblings: White Pine

Astronomers See Quartz Mirrors Made

Exploring a Particle Now Possible

Parrot Fever Not Transmitted by Birds Confined to Zoos

Finds House 5,000 Years Old at Ur

Trees Date Alaskan Glaciation

Crime Wave Spreads to Wild Animals

Front Matter

Adults Need Vitamin D

Carbon Monoxide May Now Be Removed from Auto Exhaust