A comment on GR Weekly of 2005-01-23 provoked me to clarify my worries on ‘Nature recycling us completely’. No, it’s not about chemical elements and compounds. It is about information content carried by our biochemical and biophysical content.

The laws of physics must be consistent with the existence of human thought and life itself. DNA is an information-storage medium, and biological evolution, which generates new genes, is a form of information processing. Genes could not evolve to fill ecological niches if the problems set by the physics of sunlight, water and gravity were not soluble by computations performed by quite different physical systems, such as long-chain carbon molecules.

David Deutsch: Quest for the Quantum Computer, Introduction, Simon & Schuster; 2001.

A footprint on a sandy beach :

it will be washed away by the next wave.

Is information of the (isolated) universe conserved?