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It’s a common misconception that stomach ulcers are caused by emotional upset, psychological distress, or spicy food. Yet no convincing study has ever demonstrated that these factors directly cause ulcer disease. So what does cause stomach ulcers? Rusha Modi explains how one doctor’s famous (and dangerous) experiment led us to the answer.

Lesson by Rusha Modi, directed by Black Powder Design.

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Tim Leistikow, Chris, Alex Serbanescu, Megan Douglas, Barbara Smalley, Filip Dabrowski, Joe Giamartino, Clair Chen, Vik Nagjee, Karen Goepen-Wee, Della Palacios, Rui Rizzi, Bryan Blankenburg, Bah Becerra, Stephanie Perozo, Ruby Solorzano, Ivan Tsenov, Kerstin M. Quinto, Claudia Mayfield, André Spencer, Pavel Zalevskiy.