GEOLOGY 198B. LESSON 9: SYNTHETICS AND SIMULANTS. Synthetics. Synthetics are man-made gem products. The Federal Trade Commission is quite specific in forbidding the use of the term "gem" or "gemstone"
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Natural Traditional Chinese Martial Arts articles by Sal Canzonieri: This was my thirteenth column in Han Wei Wushu, it is about the History of Southern Shaolin martial arts …
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Holmium YAG laser is a solid state laser, where YAG (Yttrium Aluminum Garnet) crystals are doped with rare-earth holmium ions (Ho 3+). The first experiments with ...
