Vortex tubes solve spot-cooling problems. Using compressed air as a power source, vortex tubes create two air streams, one hot and one cold, with no moving parts. These tubes can reproduce temperatures form -50 to 260F, flow rates from 1 to 150 scf/m, and refrigeration up to 10,200 BTU/hr. Catalog includes technical information on these and other products.
EXAIR Corp., 1250 Century Circle N., Cincinnati, OH 45246.
A make-your-own Star Wars Sith Lightsaber hilt is heftier and better-looking than most others out there, according to its maker, Sean Charlesworth. You can 3D print it from free source files, and there's even a hardware kit available -- not free -- so you can build one just in time for Halloween.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies.
You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived.
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