**The Complexity Demon**

^{th} century the demon
was banished from physics by quantum mechanics, which regards the universe
as random. Then came chaos theory according to which the universe
is unpredictable. Today complexity makes the demon even less appealing,
since the computability of the universe is limited.

Imagine a computer made of atoms. Since information flow from atom to atom cannot exceed speed of light, there is a limit to its computing power. According to Bremermann No material system whether artificial or living can compute more than 2 x 10e47 bits per second and per gram of its mass. http://pespmc1.vub.ac.be/ASC/BREMER_LIMIT.html

**complexity demons**. Like the notion that the universe
is a computer, and we are its computations. Or the universal computer mentioned in Wolfram’s
book, whose universality is compromised by Bremerann’s
limit. We may therefore distinguish between two kinds of complexity. One which can be generated with NKS, and a complexity demon which
cannot.

Now
imagine that life on earth is a computer, and its processes are computations.
Apparently life is also constrained by Bremermann’s
limit since it ** does**** not generate its complexity from scratch.** It starts its computations from a baseline, the complexity
of a cell. This issue was discussed
in a another section