The World Health Organisation has classified air pollution as carcinogenic to humans.
The world's first clinical trial designed to explore using a hallucinogen from magic mushrooms to treat people with depression has stalled.
Genetic sequence data on a strain of bird flu has shown the virus has acquired mutations that might make it more likely to cause a human pandemic.
Europe is experiencing its first sustained transmission of dengue fever since the 1920s, with more than 1 300 people infected in Madeira, Portugal.
A Qatari man struck down with a previously unknown virus related to the deadly Sars infection is critically ill in hospital in Britain.
Science shows music has a profound effect on an athlete before and during a major sports event.
Most of Africa's languages don't have a word for cancer. How can a continent hope to treat, let alone fight, a disease that has no name?
Studies into a chemical involved in the brain's sensory and reward systems could help in the development of drugs to treat gambling addicts.
British scientists say teaching autistic children to "talk things through" in their heads might help them solve tricky day-to-day tasks.
UN health agencies say extraordinary progress has been made in the fight against Aids but a funding crisis is putting those gains at risk.