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Current Issues
![ONLINE COVER This week features a Research Article describing how airway epithelial cells use purinergic signaling to optimize fluid secretion and mucus clearance. Reduced clearance of excessively concentrated mucus occurs in individuals with chronic obstructive pulmonary disease and cystic fibrosis, and the image shows an artist's depiction of lungs, the target organ in these disorders. [Image: Chris Bickel/AAAS]](/images/homepage/covers/signaling_cover.jpg?version=20130612 "ONLINE COVER This week features a Research Article describing how airway epithelial cells use purinergic signaling to optimize fluid secretion and mucus clearance. Reduced clearance of excessively concentrated mucus occurs in individuals with chronic obstructive pulmonary disease and cystic fibrosis, and the image shows an artist's depiction of lungs, the target organ in these disorders. [Image: Chris Bickel/AAAS]")
Latest News
Insights From Social Science Benefit Government
From military strategy to public health interventions, the social and behavioral sciences improve government policy, experts told a AAAS audience.
U.S. and Iran Must Develop a Talking Relationship
The United States and Iran need to find new common ground if there is any hope of finding a compromise on nuclear issues, said two ambassadors and former hostages of Iran.
Ancient DNA Hints at Causes of Leprosy's Decline
The leprosy bacterium hasn't changed much over the centuries, suggesting the disease declined in Europe due to improved social conditions, researchers report in Science.
Science Policy
DARPA Focusing on Globally Available Technology
In addition to its ongoing efforts to protect U.S. national security via game-changing technology, DARPA is working to become the best users of globally available technology.
Education
Retired Scientists Lend a Hand to Busy Teachers
Retired scientists and engineers volunteering in K-12 classrooms give students and teachers alike the benefit of their hands-on expertise.
International
AAAS Promotes Research Cooperation with Uzbekistan
Agricultural, environmental and human health challenges suggest opportunities for cooperation between life scientists in the United States and Uzbekistan, AAAS reported.
Public Engagement
What Is Time?
The winners of Alan Alda's "Flame Challenge" contest, a chemistry graduate student and a retired engineer, offered answers that satisfied a global panel of schoolchildren.
Special Offer & Highlight
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Highlight: Planetfall
A photography exhibit featuring celestial objects, produced using data from NASA and ESA missions.
View exhibit details »
View exhibit details »
