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Create beautiful spirals by drawing a straight line. This sounds crazy, but you can with a turntable (a record player or lazy susan), paper, and pen.

In this activity, learners explore a surprising method for calculating the mathematical constant pi, known as Buffon's Needle.

Combine math and exercise with this activity. Learners count how many times in a row they can skip rope or throw and catch a ball.

Get a roll of pennies, throw them on the ground, then remove those that only show tails, and repeat with the ones left over.

This is a deceptively simple game to teach strategy, planning, and pattern analysis. In this game, learners take turns removing tokens from a board, and develop a plan to take the last piece.

In this activity, learners will estimate how many seeds are in a fruit or vegetable, then count to find out. The result: mix estimation with healthy eating.

In this activity, learners use a string and pair of scissors to find pi in the world all around them. Take the circumference of a round object with string and cut the string to that length.

In this activity, learners use transparent tape and polarizing material to create and project beautifully colored patterns reminiscent of abstract or geometric stained glass windows--no glass required

In this activity, learners make plaster casts of an animal track to learn more about animals and animal behavior.

This three-part activity shows learners how to build three meteorology tools: a wind vane, a rain gauge, and a barometer.

This is a quick game about self-assembly (page 2 of PDF under Self-Assembly Activity). Like the molecules of DNA, learners will self-assemble into a pattern by following a simple set of rules.