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Tic-Tac-Toe
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In this online version of the classic paper and pencil game, learners practice looking ahead to anticipate an opponent's move.

Pop Can "Hero Engine"
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In this activity, learners build water-propelled engines from soft drink cans.

Topological Puzzles
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In this activity, learners construct three math puzzles out of simple materials like wood, string, and Styrofoam.

Space Elevator
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In this activity, learners imagine what the world might look like if we could build an elevator to space!

Roller Coasters
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In this design challenge, learners will create their own roller coaster using household objects for the track and a marble or small ball as their cart.

Great Steamboat Race
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In this outdoor activity, learners race small boats, made of cork, balsa wood, popsicle sticks etc., to investigate the rate and direction of currents in a stream or creek.

Safe in the Sun
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In this activity on page 13 of the PDF, use a special plastic card that has been painted with a chemical that changes color when it is in UV light.

Sail Car Design
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This activity (on page 3 of the PDF under GPS: Sailboat Design Activity) is a full inquiry investigation into design optimization.

Invent on the Spot
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In this activity, learners design a device to solve a problem: how to get a ball out of a drain pipe.

Sleep Patterns
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In this activity about sleep rhythms (on page 21 of the PDF), learners will collect data about their own sleep cycles and use a fraction wheel to examine their data.

Elevator Engineering
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In this activity, learners will use household items to design and build an elevator that will carry 2 passengers to a height of 16 inches...or higher!

Papermaking at Home
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Learners will follow a specific process to make their own paper using scrap paper, newspaper, or junk mail.

Community Wind Project
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In this thought-provoking activity, learners plan a hypothetical project to build and operate wind turbines in their community.

Three Bean Salads
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This game teaches ratio and proportion by having learners make "salads" that combine three types of beans in different combinations.

Pico Cricket (Tiny Computer) Activity Ideas
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This is a web page that helps informal educators brainstorm on how to use a Pico Cricket (tiny computer) in an informal activity.

Weather Vane
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In this meteorology activity, learners build weather vanes using straws, paperclips, and cardstock.

Mating Game
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In this game (on pages 14-21), learners explore how each human being inherits genetic traits such as eye color.

Build a Tree
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This activity (on pages 13-18) has learners build a model tree and then figure out how to make their tree stand up by itself.
Alien Encounter
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Use multiplication to help the aliens find out how much fuel they need to get their spacecrafts home.

Low-Tech Water Filter for High-Impact Clean
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In this activity, learners consider the water features they might enjoy at a community park--a pond, brook, water playground (or "sprayground"), or pool--and what happens to the water over time.