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In this activity (on page 2 of PDF), learners mix oil and water. Then, they add soap and observe what changes! The activity demonstrates how oil and water don't mix, except when soap is added.

1 cent - $1 per student Ages 4 - 11 Under 5 minutes
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Learners make a simple battery out of "sandwiches" of aluminum foil, pennies, and a salt water-soaked paper towel.

$1 - $5 per group Ages 8 - 14 5 to 10 minutes
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Extract your DNA from your very own cells! First, learners swish salt water in their mouth to collect cheek cells and spit the water into a glass.

1 cent - $1 per student Ages 8 - 18 5 to 10 minutes