Why do we laugh? And what’s really going on when someone tickles us into hysterics? In this episode of Explain It Like I’m 5, Alex explores the science and psychology of laughter: from ancient theories (superiority, relief, incongruity) to modern research showing laughter as a powerful social glue.

You’ll learn why humans and even rats laugh, why we can’t tickle ourselves, and how laughter boosts immunity, relieves stress, and even burns calories. Plus: quirky laughter facts, the health perks of giggles, and whether tickling counts as a secret “superpower.” New episodes every Monday and Wednesday!