[extropy-chat] Aging as a function of bone marrow degradation

[Lifespan Pharma Inc/ MFJ-CTO]

Re-the brain:

The blood brain barrier is a neat way to segregate the access of this 
process into 2 categories, body tissue regeneration and
brain tissue management.  We certainly do not want to be smashing and 
bashing about in the brain the same way as in the rest of the body.  
Biology has laid out these systems really neat this way.