Light can be a type of pollution. Learn about the damage it causes to people and living things as well as how you can prevent it.

Gamma rays might make you think of cancer, harmful radiation or superheroes. But gamma rays have lots of uses: food safety, manufacturing and even medicine!

What is the difference between sound and noise? How do they affect your hearing? And is noise always a bad thing?

Rainbows are beautiful examples of optics in nature. We see them thanks to the reflection and refraction of visible light and water.

How does the human eye see visible light as colour? And why do some people see more colours than others?

The human eye lets us see the world by sending impulses to our nervous system. In many ways, it is very similar to other optical devices, including cameras.

Could we use radio waves to charge electrical technologies in the future?

A Canadian researcher built the first voltage-controlled synthesizer in the 1940s.