This rock is radioactive, so care must be taken when handling it.

We will use cesium in this chemical experiment.

His computer detected a virus.

This device can detect abnormalities at an early stage.

This area is affected by radioactive fallout from past nuclear tests.

I add milk to my cereal and eat it every morning.

Education about sex is very important.

He is a very powerful magician.

His unrestrained behavior puzzled the people around him.

The wizard used magic to help the villagers.