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    NASA
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    In this activity (on pages 13-16 of the PDF) learners investigate three mystery samples to see which one contains life. The three samples are sand, sand and yeast, and sand and antacid. During the...

    1 cent - $1 per group Ages 4 - 14 30 to 45 minutes
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    NASA
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    In this activity (on pages 22-24 of the PDF), learners match extreme enviroments with life forms they support. The environments are shown in one series of printable cards (the "Can Living...

    1 cent - $1 per group Ages 4 - 14 45 to 60 minutes

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