Whati is life?

This nice video points to an important question. It is very easy to tell life from death, but it is very difficult to give a definition. It is commonly held that life = DNA, but DNA is obviously dead stuff, and this rises the questions discussed in the video. In my opinion life is a system that is able to repair itself. A cell is life, a virus is dead but a virus in a cell is living, and when we will make software that repairs itself we wouldl have created a rudimentary but perfectly working artificial life. Evolution itself arises from the errors made in the process of self-reparation. Information is not life (information is in everything). Information that creates new information is life.

Of course this idea is by no means new. It is the idea of "autopoieitc machine" of Maturana and Varela, of Morin, and can be traced even to Marx, that said that men are beings the produce themselves (in the economical-phylosophical manuscripts).