- Compressed sensing was briefly raised as a topic of interest, though the conversation pivoted away before any technical details were explored.  
- A short debate framed “defectors” from social contracts in memetic terms, comparing the spread of ideas like property ownership to pathogenic infection and questioning whether individuals who adopt such ideas should be labeled defective.  
- Fiber-laser metal engraving was discussed as a practical tool for fine-pitch PCB prototyping; a Kurokesu blog post (https://www.kurokesu.com/main/2021/01/07/making-fine-pitch-pcb-prototypes-with-fiber-laser/) was shared, along with questions about EZCAD compatibility on Linux.  
- Related open-source hardware efforts were noted, including the Miller Lab’s OpenSLS project (https://github.com/MillerLabFTW/OpenSLS) that repurposes an 80 W CO₂ laser for selective laser sintering.  
- An additional YouTube demo (https://www.youtube.com/watch?v=IPFZg8989ac) showed low-cost FAP800 diode-laser sintering, with the caveat that suitable power supplies remain a barrier.  
- Fullerenes were dismissed as an inefficient form factor for most applications, with criticism that curvature disrupts favorable resonance unless the structures are very large.  
- Lightning Network documentation on the diyhpluswiki was updated to correct references from “L2” to “Eltoo,” prompting clarification that Eltoo is a proposed layer-two enhancement for Bitcoin’s Lightning Network, not a machine-learning term.