- A debate on the “singularity” concept questioned whether it is a discrete event or a smooth exponential curve, with fenn arguing that singularities have no “corner” and that progress is continuous rather than reaching a specific percentage toward a technological tipping point.  
- nmz787_w explored using a cheap pressure-washer as a pump to compress CO₂ into the supercritical regime (≈1,071 psi) for DIY supercritical-fluid extraction or critical-point drying, noting that threaded pipe rated to ~2,000 psi is commercially available.  
- chris_99 and others discussed zeolite molecular sieves for ethanol dehydration and oxygen-nitrogen separation via pressure-swing adsorption, sharing links to a homemade PSA oxygen concentrator and an introductory PDF on zeolite sieves.  
- fenn linked to a blog post and arXiv paper describing an unsupervised predictive recurrent network that learns from continuous video, framing it as “not quite a neural network” but a scalable approach to predictive vision.  
- kanzure highlighted a CoinDesk deep-dive on Bitcoin’s security model and an R2D3 visual introduction to machine learning, while also critiquing much of ML practice as “cargo-culting.”  
- nmz787_w reported progress on converting OpenSCAD designs to BRL-CAD via a Python library, noting API differences and the need for better handling of rotations and extrusions in the translation layer.  
- Solvaring asked whether 20 mg sublingual noopept exceeds the standard oral dose, prompting brief discussion on dosing routes.  
- maaku observed that the film adaptation of “Inferno” removed all transhumanist plot elements, calling it a wasted opportunity.