- A Nature paper on “Holographic acoustic elements for manipulation of levitated objects” was circulated, detailing phased-array ultrasound that can trap and move millimetre-scale objects in mid-air without contact.  
- Hackaday’s “high-energy gardening” post (irradiating plants to induce mutations) was critiqued for omitting the IAEA Mutant Variety Database; two corrective PDFs were shared—one on electron-beam biotech equipment and another on unintended molecular consequences of plant transformation.  
- A nanoscale metal 3-D-printing technique was highlighted that uses an AFM/STM cantilever tip as an electrochemical deposition electrode, achieving sub-micron resolution via local electroplating.  
- DIY laser-etching experiments were discussed, including PWM laser control on a mini engraver and the trade-offs of adding an RC filter versus dynamically modulating power with stepper-motor acceleration to reduce mechanical noise.  
- A Rigol DS1074Z oscilloscope limitation—its inability to trigger on Math functions—prompted a “poor-man’s differential probe” idea using two channels and A-B subtraction.  
- Joylent, a European soylent-style meal replacement, was sampled and judged “better than canteen food,” illustrating grassroots interest in quantified-nutrition products.  
- Participants linked to an Adobe Slate presentation critiquing contemporary science fiction for shallow depictions of future technologies.