This TED video of Christoph Adami is about life, and how to look for it. He begins by talking about the apparent difficulty in defining life (click here for a post about inorganic life) (funny that he mentions the creature that can age backwards, more about that here), and goes on with a discussion about artificial life on the computer. Finally, he answers the question 'How to look for life?' by frequency distributions. He concludes:

•  Life can be defined in terms of information processes.
• We can make life inside a computer, and
• We are able to look for life that's unlike what we know.

Hope you enjoy it.