Studies of how the human engine burns calories help to explain why physical activity does little to control weight—and how our species acquired some of its most distinctive traits
The latest astrophysical measurements, combined with theoretical problems, cast doubt on the long-cherished inflationary theory of the early cosmos and suggest we need new ideas
Aerial drones and chaos theory help researchers explore the many ways that microorganisms spread havoc around the world
The long-running effort to ditch the decaying, 19th-century artifact that defines the kilogram nears its conclusion
New studies show cosmic radiation could be even more damaging to astronauts' brains than we thought. Can humanity still live and travel among the stars?
Millions of patients depend on a rare radioactive form of one element to scan them for disease. But the old nuclear reactors that make it are shutting down
Before cell phones, rural peoples around the world communicated with elaborate languages constructed of whistles.
Images from the Archive of Scientific American
The social network has rolled out new tools to deal with this growing problem
Our metabolic engine fueled the emergence of hallmark traits
- From the Editor
- The Science of Health
- The Science Agenda
- Anti Gravity
- 50, 100 & 150 Years Ago
- Graphic Science