Who counts as a significant other?

Finding "the one" can seem like life's ultimate goal—but should it be? This hour, TED speakers expand the definition of life partnership, whether it's with a friend, a spouse, a pet, or no one at all. Guest include journalist Rhaina Cohen, marriage and family therapist Stephanie Yates-Anyabwile, social psychologist Bella DePaulo and photographer Elias Weiss Friedman of "The Dogist." Original…