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String is floppy, so it’s usually a terrible thing to build a tower from. But this tower uses tension and string to hold itself strong!

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!

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!

Drop the ruler, watch for the jump… that’s the point of drop jump! Can you work out which matchbox tray the coin will fall into?

A magnifying glass can bend light waves to make an object look bigger. Can you make a magnifying glass for sound waves too?

Written by Gabrielle Tramby and Rachel Fitzgerald In this activity, you’ll turn a number into a necklace.

Normally, when you blow on a piece of card, it flies away. But in this activity, you can blow to pull the card towards you with the science of air pressure!