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Professor John Endler traveled to Trinidad in the 1970s to study wild guppies. In this activity, learners take part in an online simulation of Endler's work.

1 cent - $1 per group Ages 11 - adult 45 to 60 minutes
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In this design challenge activity, learners build a rubber band-powered rover that can scramble across the room.

1 cent - $1 per student Ages 11 - 18 30 to 45 minutes
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In this design challenge activity, learners build a tower that can support a tennis ball at least 18 inches off the ground while withstanding the wind from a fan.

1 cent - $1 per student Ages 8 - 14 30 to 45 minutes
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In this design challenge activity, learners use tubes of newspaper to make a table that’s at least eight inches tall and strong enough to hold a heavy book!

1 cent - $1 per student Ages 8 - 14 30 to 45 minutes
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In this activity, learners investigate how geometry plays a role in perspective.

1 cent - $1 per group Ages 8 - 18 45 to 60 minutes
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This activity is designed to accompany the PBS documentary about African-American chemist "Percy Julian: Forgotten Genius." Learners look through two cups with small holes in them to simulate what it'

1 cent - $1 per group Ages 6 - adult 5 to 10 minutes