Some believe it is just a figment of overactive imaginations. But evidence is growing that the so-called "axis of evil" – a pattern apparently imprinted on the radiation left behind by the big bang – may be real, posing a threat to standard cosmology.

According to the standard model, the universe is isotropic, or much the same everywhere. The first sign that this might not be the case came in 2005, when Kate Land and João Magueijo of Imperial College London noticed a curious pattern in the map of the cosmic microwave background (CMB) created by NASA’s WMAP satellite. It seemed to show that some hot and cold spots in the CMB are not distributed randomly, as expected, but are aligned along what Magueijo dubbed the axis of evil.

Studies of human tumor cells implanted in mice have shown that the abnormal activation of four genes drives the spread of breast cancer to the lungs. The new studies by Howard Hughes Medical Institute researchers reveal that the aberrant genes work together to promote the growth of primary breast tumors. Cooperation among the four genes also enables cancerous cells to escape into the bloodstream and penetrate through blood vessels into lung tissues.

The rich don't get richer -- at least not in laboratory games. According to a new study of behavioral economics, published in the April 12, 2007 issue of Nature, people will spend their own money to make the rich less rich and the poor less poor. They do so without any hope of personal gain, acting, it seems, out of a taste for equality and sense of fair play.

Earth's polar regions. These clouds have grown brighter and more prevalent in recent years and some scientists suggest that changes in these clouds may be the result of climate change.

The first opportunity for launch is on Wednesday, April 25 from Vandenberg Air Force Base, Calif., aboard a Pegasus launch vehicle.

A disturbingly high prevalence of self-reported drinking and driving has been found among Spanish health professionals. Published today in BMC Public Health, the study reveals that Spanish doctors and nurses are self-reporting drink driving at even higher rates than other university graduates.

In a study that could help reveal how illusions are produced in the brain's visual cortex, researchers at the UCSD School of Medicine have found new evidence of rapid integration of auditory and visual sensations in the brain. Their findings, which provide new insight into neural mechanisms by which visual perception can be altered by concurrent auditory events, will be published online in the April 12 edition of the Journal of Neuroscience.