Why do humans press palms with strangers? That deceptively simple question leads us down a fascinating historical path stretching back thousands of years. What began as an ancient safety measure—extending empty hands to prove you weren't concealing weapons—has evolved into one of humanity's most universal gestures of trust and connection. What's Your Wonder? Is there something you’ve been wondering about that you think would make a great episode of I Wonder? We’d love to hear from you! Submit...