1. Why Do We Yawn—and Why Is It Contagious?

Everyone does it, but no one knows exactly why. Theories range from regulating brain temperature to signaling tiredness or boredom. And then there’s the contagious part—why seeing someone yawn makes you do it too. Empathy? Mirror neurons? Maybe. But even with brain scans and studies, science still can’t give a definitive answer.

2. How Placebos Actually Work (Even When You Know They’re Fake)

Placebos aren’t just sugar pills—they often trigger real changes in the body. Pain relief, symptom reduction, even improved mood. The strangest part? Studies show that even when people know they’re taking a placebo, the effect can still work.