Mars Express
Europe's space program takes a step forward—in science and prestige.
by Robert Kunzig, Photography by Ferit Kuyas
Anything Into Oil
Technological savvy could turn 600 million tons of turkey guts and other waste into 4 billion barrels of light Texas crude each year.
Emotions and the Brain: Love
Are we finally getting good enough at biochemistry to understand the mystery—and magic—of romance?
America's Culture of War
About 800 years ago, Native Americans in the Southwest began building stone citadels and sky-high pueblos. What were they afraid of?
Where Do We Come From?
A new generation of DNA genealogists stand ready to unearth our ancestors. We may not like what they find
The Gift of Salmon
In Alaska, biologists are learning that when wild salmon are free to swim upstream to spawn, dozens of other species flourish too
