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That Sinking Feeling
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In this quick activity, learners observe how salinity and temperature affect the density of water, to better understand the Great Ocean Conveyor.

Matter on the Move
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Learners observe and conduct experiments demonstrating the different properties of hot and cold materials.

Hovercraft
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In this activity, learners make plates levitate! Learners build "hovercrafts" using simple materials to explore friction and motion.

Make and Fly a Helicopter
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Learners follow the template to build and fly a paper helicopter.

Twist and Spout
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In this activity, learners make their own "tornado" using two soda bottles and water.

Which Parachute
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In this activity, learners will engineer three different parachutes to test how well each one works.

The Power of Words
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This simple, yet surprising physics demonstration challenges preconceptions about forces, and demonstrates the strength of atmospheric pressure.

Glider
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In this activity, learners construct paper airplanes that twist and turn.

Toasty Wind
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In this quick activity, learners use a toaster to investigate the source for the Earth's wind. Learners hold a pinwheel above a toaster to discover that rising heat causes wind.

The Rumblin' Road: Determining distance to a Thunderstorm
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In this activity, learners discover how to determine the distance to a lightning strike or nearby thunderstorm.

Photosynthesis and Transpiration
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In this activity on page 7 of the PDF (Plants—The Green Machines), learners examine the effects that light and air have on green plants.

Cartesian Diver
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In this demonstration, learners observe the effects of density and pressure. A "diver" constructed out of a piece of straw and Blu-Tack will bob inside a bottle filled with water.

Float Your Boat
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In this physics activity, learners will explore buoyancy.

Floating Head Cup
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In this activity, learners watch a figure "magically" float up through the air.

Updrafts in Action
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In this weather activity/demonstration, learners watch as a ping pong ball is suspended in a stream of air supplied by a hair dryer.

Hovercraft
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In this activity, learners build a hovercraft using a paper plate, cup, and simple motor.

Rocket Reactions
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The "Rocket Reactions" activity is an exciting way to learn about how materials interact, behave, and change.

Parabola Basketball
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In this activity, learners build mini-basketball courts and explore the laws of physics. Learners discover that everything you throw or shoot on earth travels in a parabola.

Atmospheric Collisions
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In this activity/demonstration, learners observe what happens when two ping pong balls are suspended in the air by a hair dryer. Use this activity to demonstrate how rain drops grow by coalescence.

Balloon Car
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In this activity, learners explore force and motion by constructing cardboard cars that are propelled by balloons.