Why in the world do onions make us cry? How in the world does it even work? And what in the world would happen if onions were to lose this special power? Join Guy Raz and Mindy Thomas as they pull back the layers on your breath's best frenemy, and take you on a stinky adventure that cuts so deep, it might just leave you with a tear in your eye. Grab your tissues, friends! It's our Boo Hoo-iest episode of Wow in the World yet! Originally Aired November 6th 2017.