Project Hail Mary: A Novel
Andy Weir
Ryland is explaining human biology and medicine to Rocky, contrasting how Eridians have fortress-like, sealed bodies that rarely get diseases, while humans live in a more open, vulnerable biological 'borderless police state.' He explains antibiotics — how humans discovered that other Earth organisms evolved chemicals to fight shared diseases — and then explains antibiotic resistance: by killing most but not all disease, antibiotics inadvertently train pathogens to survive. The passage ends with Ryland pivoting this concept toward Taumoeba, setting up an analogy about evolution and resistance.
- Eridian bodies are nearly sealed — pathogens can't easily enter, and any that do get isolated and destroyed
- Human bodies are open and vulnerable but have powerful immune systems to compensate
- Antibiotics: chemicals from other Earth organisms that kill pathogens without harming human cells — Rocky finds this amazing since nothing like it exists on Erid
- Antibiotic resistance explained: antibiotics kill most but not all pathogens; survivors pass on resistance, making the drugs less effective over time
- Rocky grasps the concept quickly — disease evolves a defense against the chemical killing it
- Ryland is about to apply this evolutionary resistance logic to Taumoeba (the astrophage-eating microbe)
Where you left off: Ryland has just said 'Now think of Taumoeba as—' and the page cuts off mid-sentence, right as he's drawing the parallel between antibiotic resistance and potential Taumoeba resistance.