Digital Forensics: How Experts Uncover Doctored ImagesModern software has made manipulation of photographs easier to carry out and harder to uncover than ever before, but the technology also enables new methods of detecting doctored images
New Breast Cancer Treatments Help Sufferers Gain GroundThe newest targeted therapies are helping doctors to tailor increasingly effective treatments to individual patients
Does Time Run Backward in Other Universes?One of the most basic facts of life is that the future looks different from the past. But on a grand cosmological scale, they may look the same
What Is a Species?To this day, scientists struggle with that question. A better definition can influence which animals make the endangered list
The Tunguska MysteryFinding a piece of the elusive cosmic body that devastated a Siberian forest a century ago could help save the earth in the centuries to come
The Neurobiology of TrustOur inclination to trust a stranger stems in large part from exposure to a small molecule known for an entirely different task: inducing labor
The Ethics of Climate Change: Pay Now or Pay More Later?Weighing our own prosperity against the chances that climate change will diminish the well-being of our grandchildren calls on economists to make hard ethical judgments
From the Editor
Letters to the Editors
Ben Stein's Expelled: No Integrity Displayed
Our commentaries on the new antievolution movie Expelled detail its shameful attacks on science and its attempts to blame Darwin for the Holocaust
China’s Three Gorges Dam: An Environmental Catastrophe?
Even the Chinese government suspects the massive dam may cause significant environmental damage.
Matter-Antimatter Split Hints at Physics Breakdown
Scientists may have a new clue to how matter beat out antimatter for dominance of the universe.
Ask the Experts
Where Did Viruses Come From?
Tracing the origins of viruses is difficult because they do not leave fossils and because of how cunningly they make copies of themselves within cells.
The Monitor: The Space Episode
Episode 8 of Scientific American’s irreverent weekly news roundup deals with all things extraterrestrial.
R.I.P.: On the Shoulders of Giants ...
Physicist John Wheeler and geneticist Salome Waelsch both had incredibly long, fruitful careers, providing numerous fundamental insights in their fields.