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In this activity (Page 30 of PDF), learners investigate the evolution of wheat by conducting sedimentation tests on different flours.

$5 - $10 per group Ages 8 - adult 10 to 30 minutes
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This is a great activity about human energy production. Learners will work out with a clothespin to investigate why hockey players jump on a stationary bike after an intense game.

1 cent - $1 per student Ages 14 - adult 10 to 30 minutes