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According to the University of Utah press release, the mesh of molecules--at 30 to 50 nanometers wide--should be able to block any HIV particle, which is two to three times thicker (roughly 100 nanometers wide). This should also block sperm, which measure 5,000 to 10,000 nanometers (5 to 10 microns). One way to think about this nano scale is that a strand of human hair is generally about 100,000 nanometers wide (100 microns)...