Your Challenge: Build a Cost Effective Structure. 
Materials:
Toothpicks
Gum Drops
Scale
Here’s How:
PART 1: Building Geometry: Squares, Cubes, and Pyramids
In order to build a weight-bearing structures, we need to explore the different geometries and how good and/or bad they are as building elements.
1. Using 4 toothpicks and 4 gumdrops, build a square. Lay this square on the table and then stick 1 toothpick in each gumdrop, sticking straight up. Top each of these toothpicks with a gumdrop and connect these 4 gumdrops with toothpicks. You have now built a box.
2. Now you will build a pyramid. Using 3 toothpicks and 3 gumdrops make a triangle and lay this on the table. Now stick 1 toothpick in each of these gumdrops, sticking straight up. Take these 3 toothpicks, bend them into the center and connect the 3 toothpicks with 1 gumdrop. You now have a pyramid.
3. Gently press on the box and the top of the pyramid. What happens to each shape when you press on the top? Does the structure keep its shape? Does the structure collapse?
4. Based off of your observations, which shape is better for building structures: squares or triangles?
PART 2: Designing and building a weight-bearing structure
Design Parameters:
Gumdrops may not be cut or altered
Toothpicks cannot be cut or altered
The structure must be able to have weight balanced on the top
The structure must be movable
No initial testing of the structure is allowed
The weight must be held for 5 seconds
Every gumdrop and toothpick costs a hypothetical $10
Design and build a structure that will bear the most weight. The ‘winning’ structures will be the weight-bearing structure that is the most cost-effective weight.
| Cost | Points | Cost | Points |
| Cost < $200 | 50 | Cost < $250 | 45 |
| Cost < $300 | 40 | Cost < $350 | 35 |
| Cost < $400 | 30 | Cost < $450 | 25 |
| Cost < $500 | 20 | Cost < $550 | 15 |
| Cost < $600 | 10 | Cost < $650 | 5 |
Every brick that the structure can hold is worth 20 points.
The tower that earns the most points is the winner.
PART 3: Designing and building the tallest weight-bearing structure.
You will now use your toothpicks and gumdrops to build the tallest building that will hold a brick of weight for 5 seconds!
Fun Facts:
- Maine is the largest producer of toothpicks in the world, producing 90% of toothpicks used in America daily.
- A man once built a model of the Eiffel Tower out of toothpicks, which rose to 23 feet!
- In the 17th century, toothpicks were used by the upper class and created from gold.
- A man once made a 100,000 toothpick structure of San Francisco.
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