What's new

Microscope: Ghostly afterimages News

by Fiona, 26 October 2022 | 0 comments

Line drawing of a bird next to the same bird coloured red.

When we look at a very bright object and then look away from it, why do we still see the object’s outline?

Continue reading Microscope: Ghostly afterimages

Recycling rocks! A quick quiz Quiz

by David, 20 October 2022 | 0 comments

We’re celebrating recycling in this quiz! Can you salvage a passing score, or will you end up in the garbage?

Continue reading Recycling rocks! A quick quiz

Who lives next door? A brainteaser Brainteaser

by David, 19 October 2022 | 1 comments

Brain icon

Difficulty: Tricky There are 4 houses that stand in a row. One family lives in each house. The O’Connells live next door to the Taos, but they don’t live next door to the Sosas. The Prasads don’t live next door to the Sosas. Who lives next door to the Prasads?

Continue reading Who lives next door? A brainteaser


Recreating Gondwana Activity

by David, 13 October 2022 | 0 comments

Paper continents on a blue background

Back in the time of the dinosaurs, Australia was just one small part of a much bigger continent. Can you piece together the ancient supercontinent, Gondwana?

Continue reading Recreating Gondwana

Predicting the next supercontinent News

by David, 12 October 2022 | 0 comments

Map showing placement of Amasia

Have you heard of continental drift? The ground under your very feet is moving! Here in Australia, we’re moving about 7 centimetres north every year. In a few million years, we could run into Southeast Asia. But what about the far future, 300 million years away?

Continue reading Predicting the next supercontinent

Growing dough brainteaser Brainteaser

by David, 6 October 2022 | 2 comments

Brain icon

Difficulty: Extreme! Nguyệt keeps a bread dough in her fridge. She tends to it so that every day it doubles in size, and then every morning, she cuts off enough dough to make one loaf of bread for her breakfast.

Continue reading Growing dough brainteaser


Struck by lightning – a quick quiz Quiz

by David, 5 October 2022 | 2 comments

A flash and a bang! This quiz is all about electrical storms. Can you catch lightning in a bottle and get 5/5 this quiz?

Continue reading Struck by lightning – a quick quiz

What caused this circle in the desert? News

by David, 29 September 2022 | 2 comments

Orange yellow and green image with an orange dot within a ring in the centre.

In between Adelaide and Perth lies the Nullarbor, a vast, dry plain. It’s famously flat; the railway line goes dead straight for almost 500 kilometres before it needs to turn. But hidden in the saltbush, scientists saw a strangely circular hill. So where did this circle come from?

Continue reading What caused this circle in the desert?

Let’s hear it for the girls! News

by Jasmine, 28 September 2022 | 0 comments

Two girls looking at a model DNA double helix

We’re looking forward to next year’s International Day of Women and Girls in Science. So, we want to hear from Double Helix readers who are girls.

Continue reading Let’s hear it for the girls!


My favourite book brainteaser Brainteaser

by David, 23 September 2022 | 0 comments

Brain icon

Difficulty: Fun On my bookshelf, my favourite book is the third from the left, and it’s the seventh from the right. How many books are there on that shelf?

Continue reading My favourite book brainteaser