Before you recycle that cardboard box, imagine what a child might see in it.
A shelter. A vehicle. A model classroom. Perhaps the beginning of an invention that doesn’t yet have a name.
Everyday materials offer a useful starting point for STEM—science, technology, engineering, and mathematics. With a thoughtful challenge and a little guidance, children can move from simply making something to investigating how it works and how they might improve it.
For families and teachers, the opportunity begins with a question: What problem could we try to solve?
Consider a small challenge: build a stand that holds an open book using only cardboard and tape. The task sounds straightforward until the book tips forward or the cardboard bends. Suddenly, there are decisions to make. How wide should the base be? Where does the weight rest? Would folding the cardboard change its strength?
Children have a reason to measure, sketch, compare, and test. Their work becomes an investigation with a purpose.
The adult’s role is to keep that investigation moving without taking it over. Instead of rebuilding the stand yourself, ask, “Which part needs more support?” Give the child time to look closely. If they need help, offer a small hint or demonstrate one technique, then return the decision to them.
A finished model is satisfying. Understanding why it works makes the experience richer.
Even a sheet of paper can open the door to an engineering challenge. NASA’s Jet Propulsion Laboratory offers a paper helicopter activity in which students construct a simple model, test it, and investigate changes to its design. It connects an accessible classroom project with the process of developing and improving an engineering solution.
Children could compare two blade lengths while keeping the paper type and release height consistent. Before testing, invite a prediction. Afterward, ask whether the results support it. Repeat the drops rather than relying on a single attempt.
There’s an important distinction here: the paper model spins as it falls; it isn’t a powered aircraft. Recognizing what a model represents—and where the comparison ends—is part of thinking carefully about science.
Another possibility is to investigate how shapes affect strength. In the Science Buddies paper bridge challenge, students build bridges from folded paper and test the loads they can support. The activity gives children a concrete reason to compare designs and consider how changing a material’s shape changes its performance.
To extend the conversation, introduce a limit: every team receives the same amount of paper. Now the task involves making choices within a constraint. A stronger design may use more folds or a different arrangement rather than more material.
Ask children to explain those choices. “We folded it like this because…” is the beginning of a design argument. Encourage them to point to their observations rather than simply saying their model is the best.
You can also bring invention closer to children’s everyday experiences. What would make a classroom reading corner easier to use? How could a desk organizer hold different supplies? Could a model playground include spaces for different interests and ways of moving?
These are invitations to consider the people who will use a design. A desk organizer that looks attractive but falls over when someone removes a pencil still needs work. A model space that overlooks some users needs another conversation.
Children can sketch an idea, build a small prototype, invite feedback, and revise it. The prototype doesn’t have to be polished. It needs to make an idea clear enough to discuss.
Keep a simple record of the process. A notebook page divided into Our idea, What happened, and Our next change is enough to begin. Younger children might draw their observations or explain them aloud. Older children can add measurements, tables, or comparisons between trials.
This record makes progress visible. When the first version doesn’t work, children can look back and identify what they have learned instead of seeing only an unsuccessful product.
In group activities, share the decisions as well as the materials. Rotate building, measuring, testing, and recording responsibilities so that one confident child doesn’t become the permanent inventor while everyone else watches. Invite quieter participants to explain a sketch or suggest the next test. Girls and boys should have equal opportunities to handle tools, develop ideas, and lead discussions.
Choose materials and tools suited to the children taking part. Provide help with cutting where needed, keep small objects away from younger children, and conduct flight tests from standing height in a clear space.
Perhaps the most useful question comes at the end: “What would you change if you had another chance?”
It leaves the door open. The project may be finished for today, but the thinking can continue.
H3S Academy offers hands-on STEM learning experiences, science workshops, mathematics enrichment, and community learning activities. Visit our Workshops & Events page to explore listed opportunities, or contact contact@h3sacademy.com with questions.
The cardboard box on the table may still look ordinary. Give a child a worthwhile problem, room to experiment, and someone willing to listen—and see what they make of it.
