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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
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This simulation helps learners understand what happens to food as it passes through the digestive system.

$5 - $10 per group Ages 14 - 18 45 to 60 minutes