Scientists were startled when they discovered in 2004 that the center of our galaxy is emitting gamma rays with energies in the tens of trillions of electronvolts.

Now astrophysicists at The University of Arizona, Los Alamos National Laboratory and the University of Adelaide (Australia) have discovered a mechanism that might produce these high-energy gamma rays.

Purdue University researchers have created a handheld sensing system its creators liken to Star Trek's "tricorder" used to analyze the chemical components of alien worlds. But the system could have down-to-earth applications, such as testing foods for dangerous bacterial contaminants including salmonella, which was recently found in a popular brand of peanut butter.

Using a variety of new approaches, scientists at Scripps Institution of Oceanography at UC San Diego are forging a new understanding of the largest mammals on Earth.

In one recently published study on blue whales, Scripps researchers used a combination of techniques to show for the first time that blue whale calls can be tied to specific behavior and gender classifications.

Mayo Clinic researchers have safely transplanted cardiac preprogrammed embryonic stem cells into diseased hearts of mice successfully regenerating infarcted heart muscle without precipitating the growth of a cancerous tumor -- which, so far, has impeded successful translation into practice of embryonic stem cell research.

The Mayo study is the first known report establishing a successful, tumor-resistant approach to growing new heart tissue from an embryonic stem cell source. The study is published in the February issue of the Journal of Experimental Medicine.

Embryonic stem cells have the potential to become any cell type in the body. But directing the stem cells to regenerate targeted tissue is a process that hasn’t yet been perfected.

A brush with a narcissist's inflated ego often leaves one reeling with resentment. Whether it is their constant need for attention or their unfounded sense of entitlement, we are often quick to attribute their shallow behavior to an unconscious self-loathing. However, new research from Keith Campbell at the University of Georgia, Jennifer Bosson at the University of South Florida and colleagues suggests that narcissists actually view themselves the same on the outside as on the inside.

Previous studies have shown that narcissists' conscious self-views are not uniformly positive.