Ever look at an avocado and wonder: "Why is the pit so big?" In nature, a seed that size is a death sentence for a plant. If nothing can swallow it, the plant can't spread. It should have disappeared from the face of the Earth a long time ago. But it didn’t. And the reason why is honestly a bit terrifying. Kevin just sat down to break open one of the coolest mysteries in biological history. It involves 15-foot-tall behemoths, "prehistoric gardening," and the reason your favorite dip exists today