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Swallowing a watermelon seed will not cause a fruit to magically grow in your stomach

HERE’S THE INTERESTING PART

The human stomach is essentially a vat of hydrochloric acid, not a fertile greenhouse. For a seed to germinate, it needs oxygen, dirt, and sunlight—three things noticeably absent from your digestive tract. Any watermelon seed you swallow will just brave the acidic gauntlet and emerge completely intact on the other side. The only thing growing in your stomach is regret from eating too much.

Swallowing a watermelon seed will not cause a fruit to magically grow in your stomach
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