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    University of Washington
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    In this activity (1st on the page), learners explore circadian rhythms by keeping track of their body temperature. Learners measure their temperature using a standard oral thermometer every two...

    1 cent - $1 per student Ages 8 - 18 4 to 24 hours
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    University of Washington
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    In this activity (3rd on the page), learners investigate circadian rhythms by examining how well people do with estimating time. In order to explore the question, "Do people have built in...

    free Ages 8 - 18 30 to 45 minutes

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