Cane toads, fire ants and blackberry bushes - read about the environmental and economic problems caused by invasive species and try a classroom activity to learn more.

In this activity from CSIRO's Double Helix Science Club learn how to reuse your plastic bags by turning them into plastic balls of yarn.

With this activity from CSIRO's Double Helix Science Club you will learn about how tornadoes are formed and make your very own bottled tornado.

Create an El Niño effect in your own kitchen with this activity from CSIRO's Double Helix Science Club. At the same time, learn about global weather patterns.

This activity from CSIRO's Double Helix Science Club provides instructions to make your own weather vane and discover why it is useful to know which direction the wind is blowing.

This activity from CSIRO's Double Helix Science Club will help you to understand how melting ice and snow affect sea levels.

Why is the sky blue during the day and red at sunset? This Double Helix Science Club activity provides the answer.