There’s a joke in the world of radio that all you need for a HF antenna is a piece of wet string, but the truth is that rudimentary antennas rarely perform well. Random pieces of wire may pull in some ...
Optical gear: scanning electron microscope of the silicon nitride ring used to create an optical Möbius strip. (Courtesy: M Wang et al/Physical Review Letters) A Möbius strip for light has been ...
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