a Von Neumann replicator straight out of sci fi but made of meat

self-constructing, -monitoring, and -repairing better than anything we can design

innately capable of surviving a range of chemical, thermal, biological, and mechanical assaults for decades, even a century

building itself out of widely available local materials

that can collaborate to make more of itself in endless new combinations

a horrendously complicated assemblage of organic molecules that can, however poorly, hold a reflection of the universe inside a kilo of fat and ions.