Humanity has spent a very long time wondering what it means to be…well…human.  Sentient.  An individual with free will.  I believe I have summarized all the tests down into a single sentence, a single statement.  It is the ability to understand your own mortality, to realize that you could die, and yet be capable of risking it all to save someone else because you choose to.  That is the essence of being human, whatever race’s face we wear.