the engineering difficulties of interstellar #space-travel using photons as reaction mass: how do you generate that much light (positron torchships?) and how do you reflect or absorb the part that’s going the wrong way?
An #EDSL in #Python for #GPGPU programming the #Raspberry-Pi in the VideoCore assembly language.
Peggy Noonan said of Ronald Reagan: “The battle for the mind of Ronald Reagan was like the trench warfare of World War I: Never have so many fought so hard for such barren terrain,” in her memoir, “What I saw at the Revolution: A Political Life in the Reagan Era.” #history #politics
the #history of #vacuum technology, covering the development of pumping and the otherinventions that depended on it, designed for #bootstrapping a vacuum-capable lab.
#3D printing #ceramics slurry through a sponge with 85% ceramic powder and 15% water and other chemicals.
#PDF overview of #vacuum technology for the amateur, explicitly intended for #bootstrapping.
Michael D. Wheeler talks a bit about his glass #vacuum oil diffusion pump, ‘presented at the American Scientific Glassblowers Society symposium in Seattle, WA, in June 1995. The “Proceedings of the A.S.G.S. 1995 Sumposium”, “4" Glass Oil Diffusion Pump”, by Michael D. Wheeler, pages 24-30, carries the full publication.
Oh my, Springer is putting #ebook versions of all of its math texts over 10 years old online as open access.
Michael D. Wheeler talks a bit about his glass #vacuum oil diffusion pump, ‘presented at the American Scientific Glassblowers Society symposium in Seattle, WA, in June 1995. The “Proceedings of the A.S.G.S. 1995 Sumposium”, “4" Glass Oil Diffusion Pump”, by Michael D. Wheeler, pages 24-30, carries the full publication.’