More than 1 million Californians live near active oil or gas wells, potentially exposing them to drilling-related pollution that can contribute to asthma, preterm births, and a variety of other health problems.

The number of tuberculosis deaths in Europe is on the rise again after declining for almost two decades, the World Health Organization has warned.

Changes in the brain caused by Alzheimer's disease are associated with the shortening of telomeres – the protective caps on the ends of chromosomes that shorten as cells age – according to a new study.