Life thrives in the deepest, darkest recesses of Earth鈥檚 crust鈥攆rom methane seeps in the ocean floor to the highest reaches of Arctic permafrost鈥攁nd it is unlike anything seen on the surface. Join the Liberty Science Center and Karen G. Lloyd, professor at University of Southern California and author of Intraterrestrials, as we explore what scientists are learning about these strange types of microbial life鈥攁nd how research expeditions to some of the most extreme locales on the planet are broadening our understanding of what life is and how its earliest forms may have evolved.