Professor, Sir Richard Doll, the epidemiologist and former Regius Professor of Medicine at Oxford University, has died at the age of 92.

Sir Richard, along with Professor Austin Bradford Hill, of the Medical Research Council were the first two scientists to link smoking with lung cancer

This year's biggest AIDS conference will take place in Rio de Janeiro, bringing together over 5,000 scientists and doctors to discuss the latest developments in AIDS prevention and treatment.

A record number of scientific studies, focusing on developments in treatments, vaccines and basic science, will be presented

This year's biggest AIDS conference is taking place in Rio de Janeiro, bringing together over 5,000 scientists and doctors to discuss the latest developments in AIDS prevention and treatment.

A record number of scientific studies, focusing on developments in treatments, vaccines and basic science, will be presented

The Centers for Disease Control and Prevention says Americans today have lower levels of potentially dangerous substances in their blood than ten years ago.

Such substances include lead and byproducts of secondhand smoke

The Centers for Disease Control and Prevention says Americans today have lower levels of potentially dangerous substances in their blood than ten years ago.

Such substances include lead and byproducts of secondhand smoke