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In this astrobiology activity (on page 11 of the PDF), learners consider what organisms need in order to live (water, nutrients, and energy).

Over $20 per group Ages 8 - 18 1 to 4 weeks
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Water, whether fresh or salty, serves as one of the best electrical conductors on the planet. Does salt effect its conductivity?

free Ages 14 - 18 1 to 2 hours
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Water treatment on a large scale enables the supply of clean drinking water to communities.

$5 - $10 per group Ages 11 - adult 45 to 60 minutes