The appendix was long thought to be useless. It's removed in cases of appendicitis — inflammation that's especially common in children. But new research shows it may play a crucial role in supporting our immune system and maintaining gut health. Especially during bouts of diarrhea, the appendix serves as a safe haven for beneficial bacteria, helping to repopulate the microbiome and restore balance in the digestive tract. This small, overlooked organ might be more useful than we once thought!