When a child in a small Cambodian town fell sick recently, his rapid decline set off a global disease surveillance system.

A genetic analysis of the German cockroach explained its rise in southern Asia millenniums ago, and how it eventually turned up in your kitchen.

Contrary to expectation, a major study found that weed use among minors was lower in states where the drug was legal.

Contrary to expectation, a major study found that weed use among minors was lower in states where the drug was legal.

In Canada, cannabis poisonings rose sharply among people 65 and older after the country legalized the drug, a new study found.

Tens of millions of farm animals cross state lines every year, traveling in cramped, stressful conditions that can facilitate the spread of disease.