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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?

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?

We humans only have 2 legs, but a lot of creatures have many more. Do you have the legs to go the distance and get 5/5 on this quiz?

Folding origami cranes and paper aeroplanes is fun, but they tend to be made of straight lines. So what happens when you fold in curves?

Skewers are straight and pretty tough. But put just the right twist on them, and you can make something surprisingly curvy!

September is Biodiversity Month. Celebrate by taking this quiz about the variety of life you’ll find here on Earth. How biodiverse is your knowledge?

For an entire day, Ruth watched a dial clock, looking for when the hands met. She wrote down all the times they met. Which hour did the hands not meet?

Have your parents ever told you to stop playing the recorder because you’re being too noisy? Follow these instructions to turn that recorder into a bagpipe instead!

Physics can be mouth-watering. Think of the sizzle as chips deep-fry. Turns out there are 3 kinds of sizzle sounds! Can you read this without getting hungry?

This quiz is for all you maths wizards. Can you maximise your score, or does this quiz have your number?