Category: Science

What are the different stages of sleep?

Not all sleep is the same; there are five separate stages, divided up by brain activity 1 to 7 minutes: Drowsiness During the first stage of sleep you are just drifting off; your eyelids...

Are there different colours of blood?

Animals have evolved some colourful methods of getting oxygen around their bodies Humans and most other vertebrates Humans and most other vertebrates have red blood thanks to a protein called haemoglobin. Iron atoms in...

Useless Body Parts: Vestigial organs

Why have humans and other animals stopped using certain organs and functions which were once crucial for survival? Charles Darwin is one of history’s most famous naturalists. Living in the 19th century, he became...

The human body: What are electrolytes?

We need these tiny ions to keep our muscles and nerves moving Our bodies are huge biochemical batteries, and to keep our nerves firing, our muscles moving and our hearts beating, we need to...

The dangers of loud music

How can high-volume sound cause hearing loss? The way we hear sound involves an intricate series of physical, chemical and electrical activity within our ears. An integral part of our ability to hear lies...

Public swimming pools: what you don’t see

At first glance, a swimming pool might just look like a huge basin full of water, but hidden beneath the surface is a surprising amount of technology that keeps swimming pool water crystal clear....