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This is a lesson plan for an activity in which learners, playing the role of archeologists, use math concepts about number bases to decipher the Dresden Codex, an ancient Mayan document.

1 cent - $1 per group Ages 8 - adult 2 to 4 hours
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In this activity, learners explore center of gravity, or balance point, of stacked blocks.

$1 - $5 per group Ages 8 - 14 10 to 30 minutes
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In this activity, learners explore a surprising method for calculating the mathematical constant pi, known as Buffon's Needle.

$1 - $5 per student Ages 11 - 18 5 to 10 minutes
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In this math activity, learners observe and sketch cracking patterns in pavement.

1 cent - $1 per student Ages 11 - 18 10 to 30 minutes
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Did you know that you would be a different age if you lived on Mars? It's true!

free Ages 8 - 18 10 to 30 minutes
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This trick from Exploratorium physicist Paul Doherty lets you add together the bounces of two balls and send one ball flying.

$1 - $5 per group Ages 11 - adult 10 to 30 minutes
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In this activity, learners get hands-on experience with ratios and scaling while making their own jewelry out of recycled plastic containers.

free Ages 11 - 14 45 to 60 minutes