If you're 45 or older and have depression, new research suggests you may need to ask for a heart check when you next see your doctor.
More Australians over 50 are drinking and taking drugs than ever before. Here's why that can be a problem.
We still don't know what's behind four out of every five birth defects. But that can change.
Eat less meat, save the world
Southern Africa is further south than the ends of the migration routes of ducks from Europe to East and West Africa.