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Written by Gabrielle Tramby and Rachel Fitzgerald In this activity, you’ll turn a number into a necklace.

Written by Kerry Dent Difficulty: Tricky On the expedition’s small BBQ, only two potato cakes will fit at the same time.

Dip below the surface to discover the extraordinary plants and animals that call Sydney Harbour home.

Time for another quiz! We’ve got a few questions about gases you might encounter every day. Have a go and see if you can get the top score!

Normally, when you blow on a piece of card, it flies away. But in this activity, you can blow to pull the card towards you with the science of air pressure!

While working on an old weaving machine, Aisha spied a dial that needed repairing. The dial had numbers counting upwards, evenly spaced around the outside. Although she couldn’t see the whole dial, she could see that the number 6 was directly opposite 17. Can you work out how many numbers there are on the dial?

Double Helix magazine is packed with news, facts, fun experiments and giveaways, perfect for enquiring minds. Editor of the magazine, Jasmine Fellows, takes us behind the scenes to explain how they create each issue.

We’re going deep underground. Dig into your memory, and see if you can get all the answers right!

Want to reach out and touch something with a puff of air? This tiny air cannon shoots vortexes of air that can be felt from metres away!

Fred is a biologist doing an experiment with pademelons. They have a square paddock and four feeding bowls. They also have two laser detectors that each shoot a straight beam all the way across the paddock.