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This quiz has a lot of comparisons. From cosmic circles to considerable cats, can you work out the biggest?

The year is beginning to wrap up, and the summer holidays are in sight. Now is the perfect time to brush up on your paper plane skills! We’ve collected a few quick and easy designs for you to try, from a looping master to a super-fast dart with a twist.

This paper plane flies quite a bit like a regular dart. But its striking looks make it much more fun. Plus, you get two pairs of wings – front and back – that you can modify!

This is a fun design to experiment with! You can give the plane bigger wings to float more, or fold over the front edge to make the nose heavier. Make a few adjustments and see which modifications work the best.

This paper plane isn’t very fast, but with practice and adjustment, you can make it do loops!

Difficulty: Fun Sienna’s teacher is writing up a wicked problem on the board. First, the teacher writes all the numbers from 1 to 99. Then they erase 10, 20, and all the other numbers that end in 0. “Listen up!” the teacher announces. “I want you to multiply all the numbers on the board.

Imagine you’re at university, doing a maths quiz, with a calculator provided. The problem you’re tasked with reads, “Your grandmother was born in 1942, how old was she in 1994?” You think for a moment and realise it’s a subtraction problem. Into your calculator, you type “1994 – 1942”, and then triumphantly, you record the…

We’re testing your science knowledge from A to Z! From animals quirks to the age of zircon, see if you can get all five questions right.

Washing your hands is important, but how do you know if it’s working? Make some safe but gross glow germs to find out how well you wash!

Difficulty: Fun Sergio is an electrician repairing a power line. There’s a stretch of eight, evenly spaced power poles he’s working on. The distance from the first to the fourth is 120 metres. What’s the distance from the first to the eighth pole?