- A YouTube video titled “This Is Your Brain On Stale Air” was shared, prompting discussion about whether artificially lowering ambient CO₂ below normal atmospheric levels could yield cognitive enhancements beyond the well-documented benefits of improved ventilation.  
- Participants noted that the two references cited in the video only address ventilation effects, leaving open the question of sub-atmospheric CO₂ as a nootropic intervention.  
- Carbogen (Meduna’s Mixture)—historically a 5 % CO₂ / 95 % O₂ blend used in psychiatry—was highlighted as an example of controlled CO₂/O₂ manipulation with reported subjective effects, suggesting further exploration of gas ratios for cognitive modulation.  
- A Hackaday article on “Finite Element Analysis Results in Smart Infill” was linked, indicating interest in applying advanced 3-D-printing infill algorithms to optimize strength-to-weight ratios in hardware prototypes relevant to biohacking or transhumanist devices.