Our screening of Blade Runner on Saturday prompted many deep thoughts and questions about what it means to be human. The replicants that Harrison Ford is called upon to kill are artificially created humaniods that have nearly everything in common, physiologically, with normal human beings. What is it, exactly, that makes us human?

Some of the possibilities we discussed:
Genetics - being genetically human
History - having a story, telling stories
Art - creating things for aesthetic, rather than practical, reasons

What do you think? What would you add to this list? What clarifications or caveats would you add?