- A Reddit-discovered “fluorescence effect” on PCBs was discussed: ≈5 A current heats the solder mask, causing a visible change under UV light; chris_99 is turning this into a 15×15 pixel display by selectively masking circular pads and driving them with an STM32F302R6T6 ARM MCU.  
- The Shanghai Jiao Tong “SAIT SPA2011” cable-driven robot arm project was linked as an example of compact, base-mounted motor-and-pulley actuation.  
- Ben Goertzel’s new AI-driven hedge fund, Aidyia, was announced; participants compared it to Webmind’s earlier attempt to monetize AI for trading.  
- A brief side debate on Goertzel’s business model joked that it centers on “never paying anyone” versus “getting someone else to pay.”  
- Raman spectroscopy was mentioned (initially mis-typed as “riehmann”) in the context of searching scholarly literature.