Feature

Light from Receding Nebulae Reaches Earth at Usual Speed

New Find Points to Man’s Descent from Sea Scorpion

Ancient Plants Gathered Lime to Help Build Rocks

Front Matter

Nerves Grow as If with Aim A.A.A.S. Prize Paper Shows

Prize Winner Describes Study of Living Nerves of Tadpole

Animal Immunized against Parasite for First Time

Infantile Paralysis Caused by Disappearing Microbe

New Synthetic Rubber Process Is Explained

[Photograph]: Tide-Predictor

What Leapyear Skies Have to Offer

In Science Fields