Researchers have found that the band gap of semiconductor indium nitride is not 2 eV as previously thought, but a much lower 0.7 eV. Scientists from the Lawrence Berkeley National Laboratory, Cornell University, and Japan's Ritsumeikan University have discovered that a single system of alloys incorporating indium, gallium, and nitrogen can convert virtually the full spectrum of sunlight to electrical current. Such a discovery could eventually lead to the delivery of the most efficient and relatively inexpensive solar cells. For more information, go to www.lbl.gov/science-articles/archive.
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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