News
- Earth
Irony on High: Global warming cools, thins upper atmosphere
Increasing concentrations of carbon dioxide and other greenhouse gases in the air, which cause temperatures at Earth’s surface to warm, will turn the upper layers of the atmosphere cooler and thinner in coming decades, new research suggests. This counterintuitive phenomenon, first predicted in the late 1980s and recently inferred from satellite data, will probably lead […]
- Planetary Science
The Big Picture: Cassini spies Titan’s tall mountains
A spacecraft has discovered the largest mountains known on Titan, Saturn's smog-shrouded moon.
- Health & Medicine
AIDS Avoidance: More studies find that circumcision deters HIV
Two large trials in Africa find that male circumcision limits HIV infection, which could prompt governments on that continent to promote or subsidize the operation.
