Who Is Out There: Why Alien 'Life' May Be Weirder Than We Imagine

If we want to discover alien life out there in the universe, we first need to figure out where to look-and what we're even looking for. Will it be biological like us? Could it be artificial, or take some other form we haven't yet considered? And how do we find something so fundamentally different from ourselves? In this program, scientists devise plans for searching for beings beyond Earth while they grapple with the very definition of life.