• diyhpluswiki added new transcripts of Greg Maxwell discussing Bitcoin Core testing practices, the value of multiple protocol implementations, and the concept of “useful proof-of-work” (links: http://diyhpl.us/diyhpluswiki/transcripts/greg-maxwell/).

• Participants debated why medical ultrasound hardware is so expensive; one claim was that 40 % of the price is captured by sales-rep commissions.

• nmz787 proposed an open-source desert water-harvesting experiment: burying long, shallow pipes in a mountainside trench to condense atmospheric moisture without zeolites, arguing it is easier than drilling a deep well.

• fenn countered that such a trench would gradually warm and stop condensing, but could still serve as a passive cooling system for buildings; he also noted that if a true subsurface frost line exists, the site is likely at high latitude and heating, not cooling, is the bigger problem.

• L29Ah shared Harry Frankfurt’s essay “On Bullshit” (PDF: http://www2.csudh.edu/ccauthen/576f12/frankfurt__harry_-_on_bullshit.pdf) as recommended reading.

• lsneff linked a LiveScience article warning that Earth may be heading toward a “Hothouse” climate state not seen in 50 million years (https://www.livescience.com/oldest-climate-record-ever-cenozoic-era.html).