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On the Cover

January-February 2007 Volume 95, Number 1

On the cover:

The simple act of freezing water vapor produces snowflakes with fernli...

FEATURE ARTICLES

Gauging Earthquake Hazards with Precariously Balanced Rocks *

James Brune, Matthew Purvance, Abdolrasool Anooshehpoor

Finding easily toppled boulders that are still standing provides a way to test models of seismic hazard

Why We Develop Food Allergies

Per Brandtzaeg

Coached by breast milk and good bacteria, the immune system strives to learn the difference between food and pathogens before the first morsel crosses our lips

When Averages Hide Individual Differences in Clinical Trials *

David Kent, Rodney Hayward

Analyzing the results of clinical trials to expose individual patients' risks might help doctors make better treatment decisions

The Mysterious Origin of the Sweet Apple *

Barrie Juniper

On its way to a grocery counter near you, this delicious fruit traversed continents and mastered coevolution

The Formation of Snow Crystals *

Kenneth Libbrecht

Subtle molecular processes govern the growth of a remarkable variety of elaborate ice structures

* access restricted to members and subscribers

SCIENTISTS’ BOOKSHELF

A review of The God Delusion, by Richard Dawkins. Dawkins, who is bent on skewering religion by putting it to the test of rationality, is perhaps too quick to dismiss the possibility that it fills a deep-seated need in people

See all book reviews for this issue.