Exhaustive (exhausting?) description by our old acquantence Terry Ritter.

Quoted: LED Christmas lights maintenance and repair. A Ciphers By Ritter page.

I find old industrial sites the most fascinating things to wander through. I can't quite imagine that this exists as it is described. Great pictures, though.

This isn't portland cement (lime-silica: normal cement) it's a form of calcium aluminate cement (line-alumina: the stuff they line refractory kilns with). But, it's fairly transparent and hard as my head and dead cheap: now it's conductive as well. Might be a great replacement for toxic and expensive transparent rare-earth conductors.

Amazing amateur science website published by a university student in Michigan.

Quoted: Complete, illustrated instructions for the synthesis of several different chemical compounds, outlines of lab procedures and methods utilized for the manufacture of POWERLABS rocket fuels and other relevant chemicals.

The EBM machine produces components from Ti6Al4V (Ti64) and Ti6Al4V ELI, two commonly used alloys in the aerospace industry. The Ti64 parts exhibit properties (figure 3) that match those of wrought materials and exceed those of investment castings.

Quoted: Electron Beam Melting is a new alternative for both rapid manufacturing and prototyping metal components with direct benefits to the aerospace industry. The ability of Arcam and Stratasys to produce titanium parts in hours creates new opportunities for prototyping and low-volume production.