- Helium-3 lunar mining is dismissed as economically irrational because terrestrial production via deuterium-tritium reactors already yields more He-3 than would be worth shipping from the Moon.  
- Participants question the mechanical practicality of lunar harvesters, speculating that abrasive lunar regolith would cause equipment seizure within minutes to hours.  
- Quorn mycoprotein and Solein (knallgas bacteria single-cell protein) are highlighted as mature, high-efficiency food technologies that bypass traditional agriculture and photosynthesis, requiring only hydrogen, CO₂, and electricity.  
- Fenn presents rough neutron-spallation calculations suggesting He-3 breeding in fission reactors could achieve ~20 % energy return on energy invested, framing it as a potential “nuclear battery” for aneutronic spacecraft propulsion.  
- Key engineering barriers to reactor-bred He-3 include the high cost of lithium-6 enrichment, long-term handling of radioactive tritium (12.6 yr half-life), and competition for neutron economy with fissile breeding.  
- The channel debates the symbolic versus practical value of lunar agriculture, conceding that growing plants on the Moon is scientifically inefficient yet inspirational for public engagement and settlement narratives.