2020 was definitely the year for being very aware of how germs travel and spread between people. Luckily, our bodies have lots of ways to protect us from potential pathogens.
This stretchy snot slime activity is taken from my latest book Gross Science, and illustrates the role snot plays in our immune system.
Make a Snot Trap
Snot is a bit of a superhero when it comes to protecting the inside of the body from harmful pathogens. Sticky snot sits in the nose, helping filter air and trapping smoke, dirt, dust, and pathogens that might make people poorly before they reach the lungs.
On a less gross note, snot also warms and moisturises the air we breathe, making it much more pleasant for the lungs.
Remember, snot is usually clear unless you’re fighting an infection. The green colour comes from dead viruses and white blood cells. Urghh!!
You’ll need
- 1/2 cup cornstarch ( cornflour )
- Water
- 1 teaspoon green food colouring
- Cinnamon or pepper
- Bowl
- Wooden spoon
How to make a snot trap
Pour the cornstarch into the bowl and slowly add water, mixing the whole time until you have a thick liquid.
Put your hands in the bowl and squeeze the messy liquid; it should turn hard in your hands, a bit like hard snot!
Let the liquid run through your fingers to create runny snot!
Sprinkle a little cinnamon or pepper onto the surface of the snot. It will stick to the snot. Imagine the cinnamon is dust or a pathogen that you don’t want getting into your lungs. The Snot has trapped it and stopped it from reaching the inside of your body.
Don’t forget to check out Gross Science for more poo, snot and generally disgusting science for kids!
More Science Books for Kids
Snackable Science
Snackable Science contains 60 colourful and edible experiments to encourage kids to investigate their way around the kitchen, making magical mixtures, edible games, cell structure cupcakes, chocolate bridges, sugar structures, and even creating their own super sour candy powder!!
It’s a great way for kids to learn and create in the kitchen.
This IS Rocket Science
This IS Rocket Science contains SEVENTY exciting space themed science experiments taking explorers into space, around the solar system and back down to Earth with a bump.
Learn about friction, gravity, air resistance and the challenges faced by astronauts with this beautiful collection of science experiments and investigations.
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Last Updated on September 8, 2026 by Emma Vanstone
