Welcome to Double Helix Extra!
A little bit extra for friends of Double Helix magazine.
www.doublehelix.csiro.au
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News: Bugs are back, but where have they been?
Insect populations boom during warmer and wetter months. But have you ever wondered where they go during winter?
Continue reading the story here
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In spring, there’s an explosion of mosquito larvae!
Image: James Gathany, CDC
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Activity: Magnifying sound
A magnifying glass can bend light waves to make an object look bigger. Can you make a magnifying glass for sound waves too?
See the instructions here
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Something special makes this balloon act like a magnifying glass for sound waves
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Explode into science with Double Helix magazine!
 Time for an explosive new issue of Double Helix! We’ve seen it in the movies; now find out what really happens during explosions in space. Discover the secrets of fireworks, and what gives them their colours. Plus we’ve wracked our brains help you calculate the power of a volcano.
We’ve got plenty for you to try at home too! Make an origami popper or a lemon volcano. And if you’re up for a computing challenge, we’ll help you code your own superhero name generator!
Subscribe before 15 October to get this magazine in your mailbox!
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Quiz questions
- Which of the following species of homo is NOT extinct? Is it a) floresiensis, b) sapiens, c) neanderthalensis,
- Which planet appears brightest in the night sky? Is it a) Mercury, b) Venus, c) Mars, or d) Jupiter?
- What type of electric charge does an electron have? Is it a) positive, b) negative, or c) neutral (no charge)?
- What chemical is the main component of paper? Is it a) silicon dioxide, b) polyvinyl alcohol, c) cellulose, or d) calcium carbonate?
- Aedes aegypti is one of the deadliest animals on Earth, but what is it? Is it a) a crocodile, b) a lion, c) a mosquito, or d) a horse?
To find the answers, visit our online quiz!
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Brainteaser
 Difficulty: Tricky
Imogen has had enough of her goats getting into her veggie patch. She’s bought wire and poles, but before she starts building, she must work out what shape fence she needs.
The two options she’s tossing up are either an equilateral triangle with two metre sides, or a regular hexagon with one metre sides. Either way, the perimeter will be the same: six metres.
Imogen wants the option with more area inside. Can you help her work out which option that is?
Think you've cracked the brainteaser? Check your answer here!
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