I’m a bit last minute with Valentine’s Day this year. My 10-year-old is currently making a card next to me while I plan some easy activities for us tomorrow.
These Valentine STEM challenges are designed to be very easy and use only basic materials.
If you’re looking for something a bit more involved, check out my full collection of Valentine’s Day science experiments. The magic colour changing potions are my favourite!
Send a Valentine’s Message
The idea behind this Valentine’s Day STEM challenge is to create a delivery mechanism for a Valentine’s message. This could be a paper plane, paper spinner, zip line or any other creation that flies!
I’ve created a paper spinner template and straw rocket template to make this activity as easy as possible!
Valentine paper spinner template
Print the template, cut out the spinners, write a message and then watch the spinner fly through the air!
Valentine straw rockets
Write a message on the plane and send a unique Valentine’s Day message to a friend!
Write a Secret Message
Write a secret message with lemon or lime juice.
Lemon or lime juice makes a great DIY invisible ink for writing secret messages. Just pop the paper in the oven to reveal the message.
Blow up a Balloon Heart
This simple science activity uses an alka seltzer or baking soda and vinegar to blow up a balloon heart.
This Valentine’s Day scratch card coding activity from Code Wizards is great fun, too.
Last Updated on February 3, 2025 by Emma Vanstone
STEM activities like these are perfect for helping kids learn new things. It can spark their enthusiasm towards STEM learning. Thanks for sharing these ideas!