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 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…

What are gravitational waves?

In 1915 Albert Einstein predicted that when objects with an extremely dense mass collided with each other in space they…