- DIY microfluidics can be prototyped in minutes by drawing hydrophobic barriers with a Sharpie on glass or Scotch-tape substrates; pressing a blank polycarbonate CD surface against the inked slide creates surface-tension-confined channels without dual-patterned glass.  
- Human hair (≈80 µm) is too flexible and causes ink wicking, but fingernail edges, paper-clip edges, or simply dragging a paperclip through wet Sharpie ink reproducibly forms ≈80 µm channels, suggesting ink-layer thickness—not hair diameter—sets the final width.  
- Rapid replication tricks include scraping a metal “comb” across stacked slides to duplicate patterns and laminating laser-printed transparencies with a clothes iron or hair curler to mass-produce masters.  
- A 2009 open-access paper, “A brain-controlled wheelchair based on a P300 neurophysiological protocol and automated navigation,” was circulated as a practical reference for non-invasive BCI steering systems.  
- Participants shared links to a popular “nano song” YouTube video, a 22-inch DIY binocular build, and several open-access articles on ink-jet-printed and nail-polish-based microfluidic devices.  
- Practical constraints discussed include lack of wire cutters, laminators, or CNC actuators for micrometer alignment, and the observation that the compressible Sharpie layer acts as a soft gasket, making fluid boundaries slightly wider than the drawn lines.