Catalyst

Severe depression will strike one in five Australians at some stage during their lives. The illness can have devastating effects - it is the leading cause of suicide.

Sex is a very complicated affair - at least it is to a lizard in a cold climate. It's long been known that for some reptiles the incubation temperature of their eggs can determine their gender.

It's Murphy's Law. Right? The other lane or queue always seems to be going faster. But change into it and all of a sudden it stops and you're back in the same predicament!

Lactic Acid is blamed for that painful burning sensation you feel when you've pushed yourself a bit too far exercising. Everyone gets it. Even Olympians.

Special report on the growing use of drugs in children with behavioural disorders.

Neurotherapy

One of the changes sweeping through our society this century is that women are having fewer children, later in life.

Where on earth do we all come from? That's a question Archaeologists have been fiercely debating for years.

There is a hidden toll on our roads - the trauma of serious brain injury. To understand why, we need to see what really happens in a car crash.

When it comes to water these days every drop counts. Australians have a higher water use per capita than any other country in the world.

Studies from the Northern Hemisphere show that you can keep the cold out and the heat in by adding a green roof to a building. But in warmer climates vegetation can also cool a building down.