The National Institute of Standards and Technology now offers a new compilation of chemical and physical data in the NIST Chemistry Webbook at webbook.nist.gov. The web edition contains thermochemical properties, infrared spectral data, vapor pressure data, and mass spectral data. Access is currently free and is part of the more than 50 databases available from NIST.
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.
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