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Written by Elvina Lee Here’s a cool activity that’s perfect for a hot summer’s day! Create a curious pattern with water.

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?

Want to reach out and touch something with a puff of air? This tiny air cannon shoots vortexes of air that can be felt from metres away!

Wearing sunglasses while using a computer might seem like a bad idea. But if you use the right glasses, it can make a great experiment!

Think you understand magnets? In this hands-on activity, use a magnet to make a needle float and then fall.

Imagine a swirl of milk in a cup of tea, or a drop of food colouring in a glass of water. The way liquids move and flow is intricate and almost impossibly complex. But that doesn’t stop scientists from trying to understand this movement.

Double Helix magazine is looking for your questions! Our Microscope column answers the most intriguing science, tech, engineering and maths queries you can throw at us.

Here’s a classic activity with a showy twist. Surprise your friends by inverting a water bottle without spilling its contents!

Water in a cup sloshes around if you don’t move it carefully. What about fire? Let’s find out!