What is coral bleaching?

Coral is made of many tiny organisms called polyps. These soft-bodied animals are related to jellyfish and sea anemones and…

Does sugar make children hyperactive?

It’s accepted wisdom that consuming too much sugar will make children hyperactive, and many parents will tell you of occasions…

What was the Tully monster?

In 1958 fossil collector Francis Tully made a peculiar discovery south-west of Chicago, Illinois. Dating from 307 million years ago,…

What causes ‘pins and needles’?

This question was asked by Hannah from West Sussex, UK.¬† The medical name for the sensation we call pins and…

How do painkillers work?

When you injure yourself you feel pain. Imagine you’ve touched something hot and burned your hand – the damaged cells…

How do glasses improve your vision?

Some people wear glasses because they’re long-sighted (hyperopic), which means that they can see distant objects clearly but find it…