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In this activity, learners explore the human influences on the carbon cycle and examine how fossil fuels release carbon.

In this engineering design activity, learners will design, test, and build a “haunting machine” to solve a Sherlockian mystery.

This design challenge is an open-ended exploration of linkages, a group of parts connected by hinges, and the types of motion they can create.

Learners make their own paper using old newspaper. Learners can make their paper colorful by adding construction paper.

Students design and build their own parachutes in this hands-on engineering project.

Somatic Cell Nuclear Transfer (SCNT) is a cloning method that involves transferring a nucleus from a somatic cell of the individual to be cloned to an enucleated egg.

This activity requires a Pico Cricket (tiny computer). Learners work on designing and building a sound sensor out of household materials, like plastic wrap and cardboard.

Learners will build and experiment with their own windmills made from simple household materials.

Learners use shop tools and various materials to construct a magnetic spinner and a compass.

This lesson (on pages 46-55 of PDF) features two strategy board games -- one from Ghana and one from China. The first game, Achi, is a cross between checkers and tic-tac-toe.

Scientists use enormous wind tunnels to test the design of planes, helicopters, even the Space Shuttle.

In this math lesson, learners are introduced to proportional reasoning through modeling, sharing, and questioning techniques.

In this activity about encryption, learners cut out a secret decoder badge from a handout and use it to encode messages to each other.

A magic lantern is a light that projects an image onto a screen.

In this drawing/mapping activity, learners design plots of land while incorporating positive strategies for improving water quality.

In this delicious activity, learners get to make, taste-test and compare their own "brands" of homemade strawberry ice cream.

In this activity, learners make their own Sun tracker to explore how ancient civilizations around the world studied the Sun.

In this math lesson, learners participate in several activities where they apply measurement skills.

Learners create an Incan counting device called a quipu (pronounced kee-poo).

In this activity, learners solidify their conceptualization of cells by building a model of a cell in a ziplock bag.