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In this activity on page 3 of the PDF, learners discover how science and Halloween are fun companions as they make paper bleed.

$10 - $20 per group Ages 6 - 14 5 to 10 minutes
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You just ate a big meal and feel heartburn coming on. You take an antacid and feel better. Why? Heartburn is caused by stomach juice (an acid) burning the esophagus.

$5 - $10 per group Ages 11 - 18 30 to 45 minutes