A new survey from the American Lung Association has revealed the most polluted cities in America. Which cities topped the list? Pittsburgh ranked the highest in short-term pollution, but Los Angeles proved to be the most polluted on a year-round basis, as well as in terms of smog or ozone. Time to whip out the gas mask? If you want to know whether your city made the list, follow the "read more" link below.

Interested to know just exactly how cancer cells spread their terror? Well, you'll be getting to know and more. Researchers from the Research Institute of the McGill University Health Centre and University of Toronto have found out the these tumor cells spread out by releasing "bubbles". Read more on their discovery in the full article.

What's an extremely small, extremely common, and fond of bacteria? Simple: bacteriophages. There's more to these little critters than meets the eye, though - just check out a photo of them taken via electron microscope. For the picture and more infinitesimal news, turn to the full article after the jump.

A mouse's skin has been found to play a role in sensing oxygen levels around its environment. Knowing how pivotal rats are in the study of human diseases, these findings have positive implications once again for man. Head over the full article for more details.

If you've read the novel "War of the Worlds" by H.G. Wells, or if you've at least seen the movie, you know how important viruses were in the story. Thing is, viruses have a less dramatic - but no less important - role to play in real life, according to scientists. It has something to do with how they relate to cyanobacteria. More "viral" news spreads after the jump.

A team of scientists from Japan has created a molecule that is highly capable of reversing liver cirrhosis. It was first tested on rats and have been proven to be effective. The trick now is making it into a drug suitable for humans. Read the full article after the jump!

The Ebola virus is a fearful strain. Humans have a mortality rate of 90% with the virus. The threat of the virus was so great that it even became the model for the fictional virus used in the 1995 film "Outbreak." However, scientists are making fast progress in finding a vaccine to protect against it. Details in the full article.

Researchers from the Memorial Sloan-Kettering Cancer Center have found out that cloning is a useful technique when they treated mice with Parkinson's Disease. This is the first time animals have been treated with their own cloned cells. More details of their research in the full article.

Taking the elevator might save you time, but not your life as it could lead to the probability of developing chronic diseases. This was the latest finding according to two studies done by the University of Missouri and the University of Copenhagen. Learn more about the studies in the full article.

For those who are trying to get healthier using a refined carb diet (breakfast cereals, white bread, etc.), you may want to read the full details of a study conducted by researchers from the University of Sydney.

According to them, such diet plan can lead to lifestyle diseases such as cancer and diabetes. Know more about this after the jump!