Professor Brian Cox explains what black holes are, and how we know about them despite the fact that they’re invisible. Black holes are the most destructive forces in the universe, and can swallow ...

The interactive activity on this page is designed to visualise the states of matter and what happens when substances change state. You can use it to help your revision. There are three main states of ...

Scott Tilley is a retired veteran firefighter and fire investigator of 30 years. (Arlette Lazarenko/CBC) A retired veteran firefighter of 30 years is keeping a close eye on the wildfires plaguing ...