# Summary of ##hplusroadmap IRC Log (June 7, 2016)

* Discussion about open-source ultrasound imaging technology, including the Murgen project (https://github.com/kelu124/murgen-dev-kit), with observations that Murgen did not make its own probes and that probe development could be a useful next step.

* Conversation about ultrasound probe economics, noting that while raw piezo elements might cost around $50, 2D array probes are significantly more expensive, with many different probe types and standards in the market.

* Reference to "The attention schema theory: a mechanistic account of subjective awareness" (http://journal.frontiersin.org/article/10.3389/fpsyg.2015.00500/full), a paper discussing a theory of consciousness.

* Discussion about "metalenses" and their optical properties, debating whether they work through diffraction, reflection, refraction, or a combination of these phenomena, with suggestions for potential DIY fabrication approaches.

* Exploration of how ceramic capacitors (particularly X5R class) exhibit piezoelectric properties that could potentially be used for ultrasound applications, noting that "All class 2 ceramic capacitors using ferroelectric ceramics exhibit piezoelectricity."

* Brief mention of DARPA's "Big Mechanism" program, which appears to be related to automated extraction and assembly of causal mechanisms from research papers.