Scientists believe a molecule which controls male erections may also have a profound impact on the brain.
Up to 15,000 people aged over 75 may be dying unnecessarily from cancer each year in the UK, according to research.
The FBI says it has cracked a $50m (£30m) healthcare scam, making arrests in Florida, Michigan and Colorado.
A new type of cancer treatment has produced highly promising results in preliminary drug trials, researchers say.
A further 306 patients in England have been diagnosed with swine flu - bringing the UK total to 3,254.
If you want to get someone to do something, ask them in their right ear, say scientists.
Health officials in Australia are trying to determine how an Aboriginal man contracted and died from swine flu.