Feature

Rat Race

Front Matter

Folding into a Pure Paraffin Crystal

Old Nova Sparks a New Theory

Telling a Quagga by Its Stripes

Astronomy

The Quantum Universe: A Zero-Point Fluctuation?

Why Doesn’t the Body Reject the Fetus?

Turned to Stone

Diamonds in Nature

Family Planning: U.S. Policy Changing?

EPA Approves Compound 1080 for Collar Use