Watch a Christmas chain fountain video!

🎄 Watch a chain of beads flow upwards and out of a glass – this is surely the most fun you can have with your Christmas decorations! Every year, our children look forward to this moment almost as much as the big day itself!

🎄 You’ll notice that the chain arcs over the rim of the glass, going upwards, before being pulled downwards. So how does it work? This is a cool physics problem to ponder! It happens because the chain acts like lots of connected little rods. When you pick up one end of a rod, that end of the rod goes up, and the other end tries to go down. However, if the downward force is stopped by the pile of beads below it, there is a small kickback, and the rod is pushed upwards. That upwards thrust at each link in the chain is what makes the chain rise. This is an easy activity to try for yourself at home! Just make sure that you feed the chain gradually into the glass from one end so that it doesn’t get into a tangle when it’s flowing out. You could experiment with letting the chain fall from different heights (for example by standing on a step compared to sitting down) to see if that makes a difference to the height that the chain reaches.

🎄 Have you ever seen a chain fountain in action before? Watch a Mould effect video, otherwise known as a chain fountain phenomenon video here! It’s the perfect simple science experiment to try at home!


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COMPETITION CLOSED: WIN an epic Build Your Own marble run kit!

Get ready to race with this marble of engineering! Slot together the press-out parts to create three twisting neon tracks, just waiting for marbles to shoot, spin and whizz around.

This clever marble run kit from Build Your Own includes an ingenious lift and drop marble elevator and run switches to randomise the courses. It’s Build Your Own’s most challenging creation yet – with a build time of four hours, this kit is bound to keep the whole family busy during long weekends at home.

Designed in the UK and made from high-quality sustainable cardboard, this is one amazing piece of kit and we’ve got THREE to give away to lucky winners!

To be in with a chance of winning one of three Build Your Own marble run kits, simply answer this question in the comments:

Who is Mae Jemison?

A An engineer and NASA astronaut
B A marbles champion
C A botanist

Good luck!

This competition closes at midnight on Monday 30th November 2020. Whizz Pop Bang competition terms and conditions are here.


Whizz Pop Bang is a top-quality, gender-neutral, advert-free science magazine for families everywhere. Each issue is packed with experiments, activities, amazing facts, puzzles, jokes, riddles and more. Find out more here!


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