Welcome to Double Helix Extra!
A little bit extra for friends of Double Helix magazine.
www.doublehelix.csiro.au
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News: The beauty beneath-Underwater Sydney
Sydney’s Opera House, Harbour Bridge and stunning beaches are recognisable worldwide, but dip beneath the water’s surface and its beauty and diversity are perhaps even more breathtaking.
Continue reading the story here
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The beauty beneath the surface
Image: John Turnbull
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Activity: Make a pi necklace
In this activity, you’ll turn a number into a necklace. Pi is the name of the number you get when you divide the circumference (distance around the outside) of a circle by its diameter (distance across it). No matter how big or how small a circle is, the value of pi is always the same!
See the instructions here
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What do you notice about the pattern of the beads?
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Quiz questions
- What’s the most abundant gas in Earth’s atmosphere? Is it a) nitrogen, b) oxygen, c) carbon dioxide, or d) hydrogen?
- Where would you find the moon Phobos? Is it a) inside Saturn’s rings, b) orbiting Earth’s Moon, c) orbiting Mars, or d) orbiting exoplanet Kepler-1625b?
- What does a dendrologist study? Is it a) brain cells, b) video illusions, c) nests, or d) trees?
- What is the main component of natural gas? Is it a) carbon dioxide, b) ozone, c) butane, or d) methane?
- Where in your body would you find alveoli? Are they a) in your lungs, b) in the back of your throat, c) between your stomach and intestines, or d) inside your eyeballs?
To find the answers, visit our online quiz!
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Brainteaser
Difficulty: Tricky
On the expedition’s small BBQ, only two potato cakes will fit at the same time. If it takes five minutes to cook one side of a potato cake and five minutes to cook the other side, what will be the minimum time required to cook three potato cakes on the BBQ?
Think you've cracked the brainteaser? Check your answer here!
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