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

In this activity on page 7 of the PDF, learners explore how engineers characterize building materials.

In this activity, learners construct a home-made journal with simple, everyday materials.

In two separate bags, learners mix water with Epsom salts and detergent.

In this activity, you'll use a straw, a water bottle and a paper tube to make an instrument that's very much like a saxophone.

An ordinary camera has a lens that makes an image on film. In a pinhole camera, a small hole replaces the lens.

Electrolysis is the breakdown of water into hydrogen and oxygen. This Exploratorium activity allows learners to visualize the process with an acid-based indicator.

Make impact craters with marbles (or rocks or washers) in a container of flour. Find out what you can learn about your "comets" by the craters they make.

In this activity, learners will explore engineering concepts to construct a blanket fort using materials sourced from home.

Learners work in groups to build model cars from paper parts. First, each learner builds cars individually and the group times themselves.

In this activity, learners will explore light with reflective surfaces. Learners will make predictions and share their observations as they experiment with directing a beam of light.

In this simulation activity, learners observe what can happen when ocean waves churn up water and oil from an oil spill.

Learners analyze candy-coated sweets using chromatography. Learners use this method to separate the various dyes used to make colored candy.

In this activity (page 105 of the PDF), learners measure heart rate and blood pressure and learn how to obtain consistent measurements during repeated tests.

In this three-part activity, learners play a game and conduct two simple experiments to explore water and surface tension. Learners will have fun discovering how water "sticks" together.

In this activity, learners use found natural materials to create a water haven for bees and other insects.

This is a demonstration about how nature inspires nanotechnology. It is easily adapted into a hands-on activity for an individual or groups.

In this physics activity, learners experiment with soap bubbles to see what variables affect their size. They explore how soap film and bubbles always seek the smallest surface area possible.

In this activity on page 3 of the PDF, learners investigate how much sugar is in a soda. Learners use sugar cubes to measure and calculate the amount of sugar in a bottle of soda.

This strategy game has simple rules but can be a challenge. Players start with an empty hexagonal grid. On each turn, a player initials one empty hexagon on the grid.