Valentine's Day has come and gone. But what does “love” mean? From a recent Washington Post article (“Let’s fall in love like the ancients”, Feb.8): “For most ancient Greeks, … friendship was every bit as passionate and valuable as romantic-sexual love. Aristotle regarded friendship as a lifetime commitment to mutual welfare, in which two people become ‘second selves’ to each other.” But Aristotle also said that “love between two people should end if they are no longer alike in their virtues” – which suggests that he didn’t support the concept of “unconditional” love. What *is* our concept of "love"? What does it mean for someone to love us -- what are our expectations? What does it mean when we love someone -- what does it require of us? Is the concept of love same or different in different cultures, subcultures, societies, epochs? What is "healthy" love, what is "unhealthy" love, and how can we tell the difference (before someone gets hurt)? How does love manifest in different "pairings" (mother/child, friend/friend, spouse/spouse, dater/datee, etc)? Does the nature of love between two persons change over time & if so how?