- A Twitter thread on B-rep geometry kernels (Parasolid) explains that robust solid-modeling requires “hundreds of thousands of hand-coded edge cases” because no universal math formula covers every topology change; robustness is therefore a function of how many special-case variants a kernel implements.  
- Participants debate whether boundary-representation (B-rep) is an “engineering dead end” and contrast it with 1980s constructive-solid-geometry (CSG) approaches, noting that commercial mechanical CAD moved decisively to B-rep by the late 1980s (e.g., CATIA’s maturation around 1988).  
- Shapr3D is cited as a contemporary example of a CAD product that licenses Parasolid to avoid re-implementing the full B-rep complexity.  
- AllSpice.io is showcased as a Git-style collaboration platform for electronics: it provides visual schematic diffs, code-review workflows, and GitHub-like repositories for Altium and other PCB-design files.  
- A brief aside mentions airborne viral-vector vaccination of wild animals as an already-demonstrated technique that circumvents the need for capture and injection, highlighting its relevance to low-compliance populations.