• First experimental photographs of metallic hydrogen were shared, produced by compressing frozen hydrogen in a diamond anvil cell whose diamond surfaces had been smoothed with reactive-ion etching and coated with alumina.  
• Discussion of the Cell paper “Crystal Structure of an LSD-Bound Human Serotonin Receptor” (http://www.cell.com/cell/fulltext/S0092-8674(16)31749-4) highlighted the concept of “biased agonism,” where ligands selectively activate G-protein or β-arrestin signaling pathways.  
• Senolytic therapy was explored: the 2011 paper “Clearance of p16Ink4a-positive senescent cells delays ageing-associated disorders” (PMC3468323) and the natural product piperlongumine (PMC5191878) were cited as promising routes to eliminate senescent cells.  
• A surplus ISI SX-30E scanning-electron microscope (60 Å resolution) was offered on eBay; participants debated its rusted vacuum system, diffusion-pump refurbishment costs, and potential use for IC reverse-engineering and materials imaging.  
• DIY spectroscopy work continued: nmz787 reverse-engineered the serial protocol of a deuterium-lamp spectrometer, discussed using TOSLINK fibers or $150–$400 dip probes for liquid/solid optical sensing, and considered measuring an ethanol absorption peak near 900 nm.  
• A magneto-optical imaging technique using Bi:YIG thin-film sensors and Faraday rotation was described for visualizing magnetic fields with crossed polarizers; garnet gemstones were noted to be weakly ferromagnetic.  
• Channel log-searching methods were documented: monthly tarballs at http://gnusha.org/logs/archives/ and Internet Archive mirrors (archive.org/details/hplusroadmap-logs-*) enable bulk grep/zgrep queries for historical topics such as neurofeedback.