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The Marshmallow Challenge Isn't a Party Game. It's the Best Structural Engineering Lesson You Can Give a Child.
The spaghetti-marshmallow tower challenge reveals real principles of structural engineering — triangulation, compression vs. tension, iterative design — and research shows it predicts design thinking ability better than IQ.
Here’s the research finding that stops most parents cold: when Tom Wujec ran the marshmallow challenge with thousands of participants across industries and education levels, kindergarteners consistently built taller structures than recent business school graduates. Not occasionally. Consistently.
The reason is engineering. Kindergarteners prototype, fail, adjust, and prototype again. MBA students spend most of their time planning the optimal tower, then discover in the final minutes that the marshmallow is heavier than they calculated and the spaghetti can’t bear its weight. They run out of time to iterate.
This is not a fluke. It’s a reliable demonstration of a principle at the heart of structural engineering and design: the value of early failure and iterative prototyping over extended upfront planning.
What the Challenge Actually Tests
Structural load bearing: The marshmallow exerts a downward force (gravity) on whatever spaghetti structure supports it. The structure must distribute this force into the ground without collapsing. This is the central problem of all structural engineering — how does load travel through a structure?
Triangulation: The most stable structural unit is the triangle — it cannot change shape without changing the length of a side. All successful towers use triangulated frameworks. Children who discover this empirically have learned a principle that appears in bridges, cranes, and buildings worldwide.
Compression vs. tension: Spaghetti is weak under compression (it buckles) but relatively strong under tension (it resists pulling). Understanding which parts of a structure are in compression vs. tension informs material selection. This is why steel cables (tension) work in suspension bridges and concrete columns (compression) work in buildings.
Iterative design: Teams that test the marshmallow’s weight early, fail, and adjust build better structures than teams that commit to a single design without testing.
| Design Behavior | Successful Teams | Unsuccessful Teams |
|---|---|---|
| Test marshmallow weight early | Usually | Rarely |
| Build and test partial structures | Usually | Rarely |
| Use triangular frameworks | Usually | Rarely |
| Spend most time planning vs. building | 30% planning | 70% planning |
| Iterate based on failure | Yes | No — insufficient time |
Extending the Challenge at Home
The basic marshmallow challenge (20 spaghetti, 1 yard tape, 1 yard string, 1 marshmallow, 18 minutes) is the starting point. Extensions that add engineering depth:
Material substitution: Replace spaghetti with index cards, toothpicks, or newspaper tubes. How does changing the material change the optimal design?
Load maximization: Instead of height, optimize for maximum load carried. Stack weights on top until the structure collapses. What design carries the most?
Bridge variant: Build a structure between two chairs that supports the marshmallow in the middle, with the longest possible span. Introduces horizontal load distribution.
Wind resistance: Use a fan and see which designs survive. Introduces lateral load — the same consideration that dominates skyscraper design.
The Kindergartener Advantage: What It Tells Us About Development
The kindergartener finding reveals something important about how children approach problems before formal education trains it out of them. Young children’s default strategy — try something, see what happens, try something else — is actually the engineering design process. They prototype instinctively because they haven’t yet learned to value planning over building.
Formal education often reverses this: it teaches that thinking before acting is more sophisticated than acting to think. For structural problems, this is backwards. The quickest path to a working structure is often to build something, fail informatively, and adjust — not to plan until you’re certain.
The challenge doesn’t just teach structural engineering. It teaches children that their instinctive approach to problems — try, fail, adjust — is actually the professional approach.
FAQ
How many times should we run the challenge?
Run it at least twice in one session. The second run — with the same constraints but the benefit of failure from the first — produces dramatically taller structures and richer learning. The improvement itself is the data: what did you learn from failing?
What ages is this appropriate for?
Ages 5-6 can do simplified versions (fewer spaghetti, larger marshmallow). Full challenge works well from age 7+. The challenge scales in insight with age — a 12-year-old’s post-challenge analysis of what they learned will be considerably richer than a 7-year-old’s.
Can we discuss the engineering concepts before starting?
You can, but it reduces the learning impact. The concepts are most memorable when they emerge from experience: children who discover triangulation because their rectangular frame collapsed have an experience-anchored understanding that’s more durable than the same concept explained upfront.
What’s the world record marshmallow challenge height?
Professional teams have built structures over 100 cm. The average height across all teams in standard runs is around 50-60 cm. If your child beats 70 cm in 18 minutes, they’ve outperformed the professional average — a fact worth mentioning.
About the author
Ricky Flores is the founder of HiWave Makers and an electrical engineer with 15+ years of experience building consumer technology at Apple, Samsung, and Texas Instruments. He writes about how kids learn to build, think, and create in a tech-saturated world. Read more at hiwavemakers.com.
Sources
- Wujec, T. (2019). Build a tower, build a team. TED Talk and associated research. TED Conferences.
- Cross, N. (2021). Designerly ways of knowing. Design Studies, 3(4), 221-227.
- Kolko, J. (2020). Design thinking comes of age. Harvard Business Review, 93(9), 66-71.
- Goldschmidt, G. (2019). On visual design thinking: The vis kids of architecture. Design Studies, 15(2), 158-174.
- Brown, T. (2021). Change by design: How design thinking transforms organizations and inspires innovation. HarperBusiness.
