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In this activity, learners investigate why apples turn brown. Learners discover that lemon juice interferes with the reaction that causes the browning.

$1 - $5 per group Ages 4 - 11 2 to 4 hours
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In this activity on page 7 of the PDF (Plants—The Green Machines), learners examine the effects that light and air have on green plants.

$1 - $5 per student Ages 6 - 11 1 to 4 weeks