multi-layered tube
21X-ray fluorescence — (XRF) is the emission of characteristic secondary (or fluorescent) X rays from a material that has been excited by bombarding with high energy X rays or gamma rays. The phenomenon is widely used for elemental analysis and chemical analysis,… …
22OK Computer — Studio album by Radiohead Released 21 …
23Ballistic vest — A ballistic vest is an item of protective clothing that absorbs the impact from gun fired projectiles and shrapnel fragments from explosion. This protection is for the torso. Soft vests are made from many layers of woven or laminated fibers and… …
24Torte — Not to be confused with tort, a civil wrong at law. A torte is a cake made with many eggs and usually ground nuts or even bread crumbs instead of or in addition to flour. [ [http://www.m w.com/dictionary/torte] Merriam Webster Collegiate… …
25Moore's law — Plot of CPU transistor counts against dates of introduction. Note the logarithmic vertical scale; the line corresponds to exponential growth with transistor count doubling every two years …
26Magnesium diboride — Identifiers CAS number …
27Hydrogen economy — The hydrogen economy is a proposed system of delivering energy using hydrogen. The term hydrogen economy was coined by John Bockris during a talk he gave in 1970 at General Motors (GM) Technical Center.[1] Hydrogen advocates promote hydrogen as… …
28Niobium — zirconium ← niobium → molybdenum V ↑ Nb ↓ Ta …
29Model aircraft — A die cast Boeing 747 400 model. Model aircraft are flying or non flying models of existing or imaginary aircraft using a variety of materials including plastic, diecast metal, polystyrene, balsa wood, foam and fibreglass. Flying designs range… …
30Electronic organ — Yamaha GX1, a synthesizer organ in 1970s WERSI Scala, an …
