Curious Cat: Wow, that's great. Crayons can be all sorts of different colours, not just orange and purple. Do you know what they're made of? Martin: Are they made of wax? Curious Cat: Yes ...

Since crayons are made with wax, the stains are oil-based and therefore require a cleaning solution that cuts through the oil ...

Investigate how crayons, bricks and TV programmes are made Visit a power station to find out how electricity is generated Explore what happens to our sewage after it leaves our homes Observe iron ...