A University of Arizona researcher is part of an effort to identify the diseases carried by ticks, and she's asking people to send her samples.

Paradise Valley's ZIP code 85253 in Arizona ranks as the most expensive in the state with a median home price of $5.5 million ...

Researchers found that certain parts of the US are exposed to high levels of the toxin, putting the purity of local tap water ...

Scientists found millions of Americans may be regularly exposed to dangerous levels of arsenic, and they may not even know it.