Feature

Fluoridation Cuts Caries

Extreme Cold Key to What Makes Steel Really Hard

Ills Show in Fingerprints

Search for Scientists

Mica Flakes Are Secret of “Sandwich” Paint

[Photograph]: Maps Needed

Work of Gibbs, Long Acclaimed in Europe

Typewriter Makes Sheet Music Symbols

Five Chemicals Seal Tiny Teeth Openings

Nature Ramblings: Maize

Nobelists Found Cortisone

Underwater Movie Camera Has No Cables to Surface