A speaker is a remarkably simple device – they’re usually just a coil of wire, a set of magnets on an iron frame, and a cone. [Dan] and [Kyle] wound hundreds of feet of copper wire around a ...
ParaGard is the only brand currently manufacturing copper IUDs. They are plastic T-shaped devices about the size of a quarter. Unlike hormonal IUDs, ParaGard is wrapped with a coil of copper ...
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