- Participants explored using 600–700 kHz, 0.5–1 W ultrasound for non-invasive brain stimulation, noting 5–10 mm skull penetration and sharing the PDF “Ultrasound_brain.pdf” as a reference.  
- A phased-array tactile display concept was proposed: an adaptive-optics-controlled piezo array to focus ultrasound for high-resolution tactile feedback on skin or cortex, inspired by Ed Boyden’s tongue-electrode tactile displays.  
- DIY bioreactor and tissue-culture discussions referenced a Soviet monkey-kidney cell system for smallpox production and the practical challenges of sterile mammalian cell culture, with pointers to “Meat_on_a_stick” wiki notes on thin-sheet muscle culture.  
- Links were shared on open-source spacecraft design, orbital algae farms, AMTEC solid-state thermal-to-electric converters, and dense algae growth under red LEDs or sulfur lamps.  
- A debate on synthetic-biology standards clarified that standardization enables interoperable BioBrick-like modules, while modularity alone only guarantees separability.  
- Hod Lipson’s symbolic-regression automated-design technique was highlighted for discovering equations that fit experimental data, with recent work on gait and hidden nonlinear-dynamics approximation.  
- The group envisioned embedding SKDB (open-source hardware parts library) inside a game grammar to procedurally generate an entire multiplayer industrial ecology, contrasting with Spore’s limited asynchronous sharing.  
- Scaling challenges in open-ended simulators were addressed by using grammar-based generation, class inheritance, and locality-based interaction graphs (quadtrees) to avoid N! explosion.