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This brainteaser comes from our new book, Puzzles and Projects. This book features some of the best puzzles, hands-on activities, stories and more from Double Helix magazine. Plus, there’s stacks of new content to explore! You can buy a copy on the CSIRO Publishing website, or pick it up from your favourite bookstore!

Are you looking for some fun activities to fill your Easter break? Check out these seasonal suggestions!

It’s not just robots that rove – this quiz celebrates roving in all its forms! Can you manage to find all the right answers?

Here’s a great excuse to get your parents to buy lollies! All it takes is some warm water to reveal a beautiful rainbow.

If you journeyed to the centre of the Earth, what would you see on the way down? After breaking through the crust there’s the mantle, a layer of mostly solid rock that constantly flows like a glacier. Below that, there’s the outer core made of liquid iron and nickel. Then you come to the inner […]

Difficulty: Tricky Sian is making a big, shiny cube in Minecraft. It will be 10 blocks wide, 10 blocks deep and 10 blocks high. The outer layer of blocks will be made of gold. Everything inside the cube will be made of obsidian. Will Sian need more gold blocks, or more obsidian ones?

Through thick and thin, we love a quick quiz! We think this is one of our hardest quizzes yet. Do you have the knowledge to thin out the clues and get full marks?

There’s something soothing about a cup of lemon tea. But there’s some fun chemistry happening in that cup too!

Misrak was looking at the birthdays in her family. After a bit of maths, she realised that her father’s age and her grandfather’s age had the same digits, but swapped. When she added their ages together, she got 121. Her grandfather was aged between 20 and 40 when her father was born. Can you work […]

If you showed a movie to Nemo the clownfish, he wouldn’t be very impressed. The problem is, clownfish see colours differently to us humans. But worry not! Scientists from the University of Queensland have a TV for clownfish eyes.