# Key Points from #hplusroadmap IRC Discussion

• Participants discussed low-cost DIY photolithography systems, including a $1000 setup using Blu-ray optical components capable of 500nm resolution, with debate about direct laser writing versus LCD-based approaches for microstructure fabrication.

• Technical discussions covered positioning systems for microlithography, comparing stepper motors, lead screws, and piezo motors for nanopositioning with attention to precision requirements and backlash issues.

• Members shared anti-aging research resources from the SENS Rejuvenation Biotechnology Conference (RB2015), featuring presentations on muscle stem cell rejuvenation and regenerative materials.

• The channel explored the theoretical possibility of brain organoids being developed by military researchers for integration into robotic control systems, raising both ethical and practical questions.

• A significant academic paper "Limits on fundamental limits to computation" was shared (http://arxiv.org/abs/1408.3821), examining theoretical boundaries of computational systems.

• Participants discussed acoustic cryptanalysis of inkjet printers, debating whether ultrasonic microphones could recover printed content by analyzing sounds from piezo nozzles despite the complexity of modern printer heads.

• The community showed interest in funding open-source hardware projects, particularly for advanced fabrication technologies like photolithography and EWOD (electrowetting on dielectric).