43 percent of people are undecided, reluctant or do not wish to have their organs and tissue donated after their deaths, according to a new survey conducted by Donate Life America.

The results shows an increase in the number of people willing to donate compared to a survey conducted last year, but also suggest that a lot of misinformation still surrounds the issue.

Exercise can alleviate depression and anxiety symptoms and should be more widely prescribed to patients who can't access or won't accept traditional therapies, say mental health experts from Southern Methodist University and Boston University.

They say exercise may affect certain neurotransmitter systems in the brain the same way antidepressants do and could help patients "re-establish positive behaviors."

Their research was presented last month at the annual conference of the Anxiety Disorder Association of America.

Web sites that foster online communication and interaction are not merely vapid echo chambers of self-promotion, according to a new study in American Behavioral Scientist.

In fact, just the opposite is true. Interactions on Facebook, Twitter and other social networking sites positively impact real-life and the intersection between online communication and the offline world forms two halves of a support mechanism for local communities.

Some solar physicists have suggested that prolonged low solar activity could offset the effects of anthropogenic global warming.

But a new Grand Minimum of solar activity would decrease the rise of global mean temperature caused by human greenhouse gas emissions by at most 0.3 degrees Celsius until the end of the century, according to a recent study in Geophysical Research Letters.

The projected temperature drop is less than ten percent of the rise projected under “business as usual” scenarios of the Intergovernmental Panel on Climate Change (IPCC).

Princeton Electrical Engineers have developed a new technique for revealing images of hidden objects. The method, a new type of stochastic resonance, relies on the ability to clarify an image using rays of light that would typically make the image unrecognizable, such as those scattered by clouds, human tissue or murky water.

The discovery may one day help pilots navigate through fog and doctors peer into the human body without surgery. The findings were reported online in Nature Photonics.

ASU Biodesign Institute researchers are using the unique conditions of spaceflight to examine how cells remain healthy or succumb to disease, particularly in the face of stress or damage. Their experiment will be launched into low earth orbit on April 5 aboard the space shuttle Discovery on mission STS-131.

The team hopes to provide fundamental new insight into the infectious disease process, and further undestanding of other progressive diseases, including immune disorders and cancer. The Results of the current study will also be used to help mitigate infectious disease risks to the crew, who are particularly vulnerable to infection, due to reduced immune function during spaceflight missions.