What is Life?.. Why are we alive?

Good lecture on what is life: http://blogs.discovermagazine.com/loom/2009/04/01/what-is-life-slides-and-gramophone/

Very basic, but comprehensive... sound isn't great, and if you're not really into this stuff, I can see it being boring... but, still, really cool cuz although it leaves out the details, it is really comprehensive...