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How does a green roof, or roof covered by plants, affect the temperature of the inside and outside of a building? Learners design and build houses to find out the answer.

In this activity, learners make a 3-D model of DNA using paper and toothpicks. While constructing this model, learners will explore the composition and structure of DNA.

Teams of learners use a series of stick figures made from pipe cleaners to model a dance routine. Then, they use this model to communicate to another learner who performs the dance routine.

In this online game, learners run an outer space drink stand and thirsty alien customers are on the way.

Learners model the Sun-Earth-Moon system to show what causes the Moon's appearance to change when viewed from the Earth.

Learners will build a homemade pump using a balloon, a mason jar, and some straws.

In this engineering/design/arts and crafts activity, learners design and build "platforms" or "bridges" that can hold weight, and test which glue makes the strongest structure.

No glue is needed for learners of any age to become marshmallow architects or engineers.

In this activity, learners create a model using metric measuring tapes and atmosphere composition data.

Learners will construct a model of a heart valve using a film canister, a piece of masking tape, and a piece of paper.

Learners build a model of the planets in the solar system. In their model, the planets are spaced in their relative distance from the Sun.

By building a model of a lung and diaphragm, learners discover the function of various parts of the body's respiratory system.

In this activity, learners simulate the behavior of the atmosphere.

Educator Amy O'Donnell from the American Museum of Natural History guides learners to create a diorama of a coral reef.

In "Chemistry Makes Scents," participants use their noses to distinguish between chemicals with very similar structures.

In this quick activity about pollutants and groundwater (page 2 of PDF under Water Clean-up Activity), learners build a model well with a toilet paper tube.