It's one of the most wrenching of life's decisions: a beloved parent can no longer care for herself, and you must place her in a nursing home. The choices are bewildering.
Few American cities are adequately prepared for the excessive heat we can expect with global warming.
Last summer's news that Andrew Speaker, an American with drug-resistant tuberculosis, had taken two transatlantic flights sent travelers into a panic.
Most diseases stem from the complex interplay of genes and the environment. If diseases were caused by single genes, it might be simple to design targeted interventions.
The rise of sex tourism is challenging the accepted view of a predominantly "heterosexual" HIV/AIDS epidemic in the Caribbean.