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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?

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?

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?

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

This quiz is all about waves. Will you ride it to victory, or will you wave goodbye to your high score?

Here are 5 fresh questions to juggle for this week’s quiz. Will you score high, or come crashing to Earth?

We had our eyes on the skies as we wrote this quiz. Can you reach for the stars or are you coming back down to Earth?

These clear, shiny gemstones are very valuable and oh-so-special. Can you sparkle like a diamond and get full marks on our quiz?

This quiz is all about mums. See if you can get 5/5 in this mother of all quizzes!

By Fiona Midson and Beth Askham Here is a quantifying quiz for you to gauge! Answer these questions to see if you measure up.