> philosophizing about whether a Turing machine can simulate a human brain

Existence proof:

  * DNA transcription  (a Turing machine, as per (Turing 1936) )
  * Leads to Alan Turing by means of morphogenisis (Turing 1952)
  * Alan Turing has a brain that writes the two papers
  * Thus proving he is at least a turing machine (by writing Turing 1936)
  * And capable of simulating chemical processes (by writing Turing 1952)

Turing 1952: https://www.dna.caltech.edu/courses/cs191/paperscs191/turing...